Generalized mime type support (#17285)

* implemented generalized content-type handling

* regenerated samples

* addressed implementation review feedback

* added tests for proposed improvements

modules/openapi-generator/src/main/resources/typescript/model/ObjectSerializer.mustache

@@ -22,16 +22,6 @@ let primitives = [
                     "any"
                  ];
 
-const supportedMediaTypes: { [mediaType: string]: number } = {
-  "application/json": Infinity,
-  "application/json-patch+json": 1,
-  "application/merge-patch+json": 1,
-  "application/strategic-merge-patch+json": 1,
-  "application/octet-stream": 0,
-  "application/x-www-form-urlencoded": 0
-}
-
-
 let enumsMap: Set<string> = new Set<string>([
     {{#models}}
         {{#model}}
@@ -59,6 +49,58 @@ let typeMap: {[index: string]: any} = {
     {{/models}}
 }
 
+type MimeTypeDescriptor = {
+    type: string;
+    subtype: string;
+    subtypeTokens: string[];
+};
+
+/**
+ * Every mime-type consists of a type, subtype, and optional parameters.
+ * The subtype can be composite, including information about the content format.
+ * For example: `application/json-patch+json`, `application/merge-patch+json`.
+ *
+ * This helper transforms a string mime-type into an internal representation.
+ * This simplifies the implementation of predicates that in turn define common rules for parsing or stringifying
+ * the payload.
+ */
+const parseMimeType = (mimeType: string): MimeTypeDescriptor => {
+    const [type, subtype] = mimeType.split('/');
+    return {
+        type,
+        subtype,
+        subtypeTokens: subtype.split('+'),
+    };
+};
+
+type MimeTypePredicate = (mimeType: string) => boolean;
+
+// This factory creates a predicate function that checks a string mime-type against defined rules.
+const mimeTypePredicateFactory = (predicate: (descriptor: MimeTypeDescriptor) => boolean): MimeTypePredicate => (mimeType) => predicate(parseMimeType(mimeType));
+
+// Use this factory when you need to define a simple predicate based only on type and, if applicable, subtype.
+const mimeTypeSimplePredicateFactory = (type: string, subtype?: string): MimeTypePredicate => mimeTypePredicateFactory((descriptor) => {
+    if (descriptor.type !== type) return false;
+    if (subtype != null && descriptor.subtype !== subtype) return false;
+    return true;
+});
+
+// Creating a set of named predicates that will help us determine how to handle different mime-types
+const isTextLikeMimeType = mimeTypeSimplePredicateFactory('text');
+const isJsonMimeType = mimeTypeSimplePredicateFactory('application', 'json');
+const isJsonLikeMimeType = mimeTypePredicateFactory((descriptor) => descriptor.type === 'application' && descriptor.subtypeTokens.some((item) => item === 'json'));
+const isOctetStreamMimeType = mimeTypeSimplePredicateFactory('application', 'octet-stream');
+const isFormUrlencodedMimeType = mimeTypeSimplePredicateFactory('application', 'x-www-form-urlencoded');
+
+// Defining a list of mime-types in the order of prioritization for handling.
+const supportedMimeTypePredicatesWithPriority: MimeTypePredicate[] = [
+    isJsonMimeType,
+    isJsonLikeMimeType,
+    isTextLikeMimeType,
+    isOctetStreamMimeType,
+    isFormUrlencodedMimeType,
+];
+
 export class ObjectSerializer {
     public static findCorrectType(data: any, expectedType: string) {
         if (data == undefined) {
@@ -204,31 +246,27 @@ export class ObjectSerializer {
         }
 
         const normalMediaTypes = mediaTypes.map(this.normalizeMediaType);
-        let selectedMediaType: string | undefined = undefined;
+
-        let selectedRank: number = -Infinity;
+        for (const predicate of supportedMimeTypePredicatesWithPriority) {
-        for (const mediaType of normalMediaTypes) {
+            for (const mediaType of normalMediaTypes) {
-            if (supportedMediaTypes[mediaType!] > selectedRank) {
+                if (mediaType != null && predicate(mediaType)) {
-                selectedMediaType = mediaType;
+                    return mediaType;
-                selectedRank = supportedMediaTypes[mediaType!];
+                }
             }
         }
 
-        if (selectedMediaType === undefined) {
+        throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-            throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-        }
-
-        return selectedMediaType!;
     }
 
     /**
      * Convert data to a string according the given media type
      */
     public static stringify(data: any, mediaType: string): string {
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return String(data);
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.stringify(data);
         }
 
@@ -243,18 +281,14 @@ export class ObjectSerializer {
             throw new Error("Cannot parse content. No Content-Type defined.");
         }
 
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return rawData;
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.parse(rawData);
         }
 
-        if (mediaType === "text/html") {
-            return rawData;
-        }
-
         throw new Error("The mediaType " + mediaType + " is not supported by ObjectSerializer.parse.");
     }
 }

samples/client/others/typescript/builds/with-unique-items/models/ObjectSerializer.ts

@@ -14,16 +14,6 @@ let primitives = [
                     "any"
                  ];
 
-const supportedMediaTypes: { [mediaType: string]: number } = {
-  "application/json": Infinity,
-  "application/json-patch+json": 1,
-  "application/merge-patch+json": 1,
-  "application/strategic-merge-patch+json": 1,
-  "application/octet-stream": 0,
-  "application/x-www-form-urlencoded": 0
-}
-
-
 let enumsMap: Set<string> = new Set<string>([
 ]);
 
@@ -31,6 +21,58 @@ let typeMap: {[index: string]: any} = {
     "Response": Response,
 }
 
+type MimeTypeDescriptor = {
+    type: string;
+    subtype: string;
+    subtypeTokens: string[];
+};
+
+/**
+ * Every mime-type consists of a type, subtype, and optional parameters.
+ * The subtype can be composite, including information about the content format.
+ * For example: `application/json-patch+json`, `application/merge-patch+json`.
+ *
+ * This helper transforms a string mime-type into an internal representation.
+ * This simplifies the implementation of predicates that in turn define common rules for parsing or stringifying
+ * the payload.
+ */
+const parseMimeType = (mimeType: string): MimeTypeDescriptor => {
+    const [type, subtype] = mimeType.split('/');
+    return {
+        type,
+        subtype,
+        subtypeTokens: subtype.split('+'),
+    };
+};
+
+type MimeTypePredicate = (mimeType: string) => boolean;
+
+// This factory creates a predicate function that checks a string mime-type against defined rules.
+const mimeTypePredicateFactory = (predicate: (descriptor: MimeTypeDescriptor) => boolean): MimeTypePredicate => (mimeType) => predicate(parseMimeType(mimeType));
+
+// Use this factory when you need to define a simple predicate based only on type and, if applicable, subtype.
+const mimeTypeSimplePredicateFactory = (type: string, subtype?: string): MimeTypePredicate => mimeTypePredicateFactory((descriptor) => {
+    if (descriptor.type !== type) return false;
+    if (subtype != null && descriptor.subtype !== subtype) return false;
+    return true;
+});
+
+// Creating a set of named predicates that will help us determine how to handle different mime-types
+const isTextLikeMimeType = mimeTypeSimplePredicateFactory('text');
+const isJsonMimeType = mimeTypeSimplePredicateFactory('application', 'json');
+const isJsonLikeMimeType = mimeTypePredicateFactory((descriptor) => descriptor.type === 'application' && descriptor.subtypeTokens.some((item) => item === 'json'));
+const isOctetStreamMimeType = mimeTypeSimplePredicateFactory('application', 'octet-stream');
+const isFormUrlencodedMimeType = mimeTypeSimplePredicateFactory('application', 'x-www-form-urlencoded');
+
+// Defining a list of mime-types in the order of prioritization for handling.
+const supportedMimeTypePredicatesWithPriority: MimeTypePredicate[] = [
+    isJsonMimeType,
+    isJsonLikeMimeType,
+    isTextLikeMimeType,
+    isOctetStreamMimeType,
+    isFormUrlencodedMimeType,
+];
+
 export class ObjectSerializer {
     public static findCorrectType(data: any, expectedType: string) {
         if (data == undefined) {
@@ -176,31 +218,27 @@ export class ObjectSerializer {
         }
 
         const normalMediaTypes = mediaTypes.map(this.normalizeMediaType);
-        let selectedMediaType: string | undefined = undefined;
+
-        let selectedRank: number = -Infinity;
+        for (const predicate of supportedMimeTypePredicatesWithPriority) {
-        for (const mediaType of normalMediaTypes) {
+            for (const mediaType of normalMediaTypes) {
-            if (supportedMediaTypes[mediaType!] > selectedRank) {
+                if (mediaType != null && predicate(mediaType)) {
-                selectedMediaType = mediaType;
+                    return mediaType;
-                selectedRank = supportedMediaTypes[mediaType!];
+                }
             }
         }
 
-        if (selectedMediaType === undefined) {
+        throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-            throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-        }
-
-        return selectedMediaType!;
     }
 
     /**
      * Convert data to a string according the given media type
      */
     public static stringify(data: any, mediaType: string): string {
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return String(data);
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.stringify(data);
         }
 
@@ -215,18 +253,14 @@ export class ObjectSerializer {
             throw new Error("Cannot parse content. No Content-Type defined.");
         }
 
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return rawData;
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.parse(rawData);
         }
 
-        if (mediaType === "text/html") {
-            return rawData;
-        }
-
         throw new Error("The mediaType " + mediaType + " is not supported by ObjectSerializer.parse.");
     }
 }

samples/openapi3/client/petstore/typescript/builds/browser/models/ObjectSerializer.ts

@@ -24,16 +24,6 @@ let primitives = [
                     "any"
                  ];
 
-const supportedMediaTypes: { [mediaType: string]: number } = {
-  "application/json": Infinity,
-  "application/json-patch+json": 1,
-  "application/merge-patch+json": 1,
-  "application/strategic-merge-patch+json": 1,
-  "application/octet-stream": 0,
-  "application/x-www-form-urlencoded": 0
-}
-
-
 let enumsMap: Set<string> = new Set<string>([
     "OrderStatusEnum",
     "PetStatusEnum",
@@ -48,6 +38,58 @@ let typeMap: {[index: string]: any} = {
     "User": User,
 }
 
+type MimeTypeDescriptor = {
+    type: string;
+    subtype: string;
+    subtypeTokens: string[];
+};
+
+/**
+ * Every mime-type consists of a type, subtype, and optional parameters.
+ * The subtype can be composite, including information about the content format.
+ * For example: `application/json-patch+json`, `application/merge-patch+json`.
+ *
+ * This helper transforms a string mime-type into an internal representation.
+ * This simplifies the implementation of predicates that in turn define common rules for parsing or stringifying
+ * the payload.
+ */
+const parseMimeType = (mimeType: string): MimeTypeDescriptor => {
+    const [type, subtype] = mimeType.split('/');
+    return {
+        type,
+        subtype,
+        subtypeTokens: subtype.split('+'),
+    };
+};
+
+type MimeTypePredicate = (mimeType: string) => boolean;
+
+// This factory creates a predicate function that checks a string mime-type against defined rules.
+const mimeTypePredicateFactory = (predicate: (descriptor: MimeTypeDescriptor) => boolean): MimeTypePredicate => (mimeType) => predicate(parseMimeType(mimeType));
+
+// Use this factory when you need to define a simple predicate based only on type and, if applicable, subtype.
+const mimeTypeSimplePredicateFactory = (type: string, subtype?: string): MimeTypePredicate => mimeTypePredicateFactory((descriptor) => {
+    if (descriptor.type !== type) return false;
+    if (subtype != null && descriptor.subtype !== subtype) return false;
+    return true;
+});
+
+// Creating a set of named predicates that will help us determine how to handle different mime-types
+const isTextLikeMimeType = mimeTypeSimplePredicateFactory('text');
+const isJsonMimeType = mimeTypeSimplePredicateFactory('application', 'json');
+const isJsonLikeMimeType = mimeTypePredicateFactory((descriptor) => descriptor.type === 'application' && descriptor.subtypeTokens.some((item) => item === 'json'));
+const isOctetStreamMimeType = mimeTypeSimplePredicateFactory('application', 'octet-stream');
+const isFormUrlencodedMimeType = mimeTypeSimplePredicateFactory('application', 'x-www-form-urlencoded');
+
+// Defining a list of mime-types in the order of prioritization for handling.
+const supportedMimeTypePredicatesWithPriority: MimeTypePredicate[] = [
+    isJsonMimeType,
+    isJsonLikeMimeType,
+    isTextLikeMimeType,
+    isOctetStreamMimeType,
+    isFormUrlencodedMimeType,
+];
+
 export class ObjectSerializer {
     public static findCorrectType(data: any, expectedType: string) {
         if (data == undefined) {
@@ -193,31 +235,27 @@ export class ObjectSerializer {
         }
 
         const normalMediaTypes = mediaTypes.map(this.normalizeMediaType);
-        let selectedMediaType: string | undefined = undefined;
+
-        let selectedRank: number = -Infinity;
+        for (const predicate of supportedMimeTypePredicatesWithPriority) {
-        for (const mediaType of normalMediaTypes) {
+            for (const mediaType of normalMediaTypes) {
-            if (supportedMediaTypes[mediaType!] > selectedRank) {
+                if (mediaType != null && predicate(mediaType)) {
-                selectedMediaType = mediaType;
+                    return mediaType;
-                selectedRank = supportedMediaTypes[mediaType!];
+                }
             }
         }
 
-        if (selectedMediaType === undefined) {
+        throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-            throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-        }
-
-        return selectedMediaType!;
     }
 
     /**
      * Convert data to a string according the given media type
      */
     public static stringify(data: any, mediaType: string): string {
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return String(data);
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.stringify(data);
         }
 
@@ -232,18 +270,14 @@ export class ObjectSerializer {
             throw new Error("Cannot parse content. No Content-Type defined.");
         }
 
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return rawData;
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.parse(rawData);
         }
 
-        if (mediaType === "text/html") {
-            return rawData;
-        }
-
         throw new Error("The mediaType " + mediaType + " is not supported by ObjectSerializer.parse.");
     }
 }

samples/openapi3/client/petstore/typescript/builds/composed-schemas/models/ObjectSerializer.ts

@@ -26,16 +26,6 @@ let primitives = [
                     "any"
                  ];
 
-const supportedMediaTypes: { [mediaType: string]: number } = {
-  "application/json": Infinity,
-  "application/json-patch+json": 1,
-  "application/merge-patch+json": 1,
-  "application/strategic-merge-patch+json": 1,
-  "application/octet-stream": 0,
-  "application/x-www-form-urlencoded": 0
-}
-
-
 let enumsMap: Set<string> = new Set<string>([
     "DogBreedEnum",
     "PetByTypePetTypeEnum",
@@ -53,6 +43,58 @@ let typeMap: {[index: string]: any} = {
     "PetsPatchRequest": PetsPatchRequest,
 }
 
+type MimeTypeDescriptor = {
+    type: string;
+    subtype: string;
+    subtypeTokens: string[];
+};
+
+/**
+ * Every mime-type consists of a type, subtype, and optional parameters.
+ * The subtype can be composite, including information about the content format.
+ * For example: `application/json-patch+json`, `application/merge-patch+json`.
+ *
+ * This helper transforms a string mime-type into an internal representation.
+ * This simplifies the implementation of predicates that in turn define common rules for parsing or stringifying
+ * the payload.
+ */
+const parseMimeType = (mimeType: string): MimeTypeDescriptor => {
+    const [type, subtype] = mimeType.split('/');
+    return {
+        type,
+        subtype,
+        subtypeTokens: subtype.split('+'),
+    };
+};
+
+type MimeTypePredicate = (mimeType: string) => boolean;
+
+// This factory creates a predicate function that checks a string mime-type against defined rules.
+const mimeTypePredicateFactory = (predicate: (descriptor: MimeTypeDescriptor) => boolean): MimeTypePredicate => (mimeType) => predicate(parseMimeType(mimeType));
+
+// Use this factory when you need to define a simple predicate based only on type and, if applicable, subtype.
+const mimeTypeSimplePredicateFactory = (type: string, subtype?: string): MimeTypePredicate => mimeTypePredicateFactory((descriptor) => {
+    if (descriptor.type !== type) return false;
+    if (subtype != null && descriptor.subtype !== subtype) return false;
+    return true;
+});
+
+// Creating a set of named predicates that will help us determine how to handle different mime-types
+const isTextLikeMimeType = mimeTypeSimplePredicateFactory('text');
+const isJsonMimeType = mimeTypeSimplePredicateFactory('application', 'json');
+const isJsonLikeMimeType = mimeTypePredicateFactory((descriptor) => descriptor.type === 'application' && descriptor.subtypeTokens.some((item) => item === 'json'));
+const isOctetStreamMimeType = mimeTypeSimplePredicateFactory('application', 'octet-stream');
+const isFormUrlencodedMimeType = mimeTypeSimplePredicateFactory('application', 'x-www-form-urlencoded');
+
+// Defining a list of mime-types in the order of prioritization for handling.
+const supportedMimeTypePredicatesWithPriority: MimeTypePredicate[] = [
+    isJsonMimeType,
+    isJsonLikeMimeType,
+    isTextLikeMimeType,
+    isOctetStreamMimeType,
+    isFormUrlencodedMimeType,
+];
+
 export class ObjectSerializer {
     public static findCorrectType(data: any, expectedType: string) {
         if (data == undefined) {
@@ -198,31 +240,27 @@ export class ObjectSerializer {
         }
 
         const normalMediaTypes = mediaTypes.map(this.normalizeMediaType);
-        let selectedMediaType: string | undefined = undefined;
+
-        let selectedRank: number = -Infinity;
+        for (const predicate of supportedMimeTypePredicatesWithPriority) {
-        for (const mediaType of normalMediaTypes) {
+            for (const mediaType of normalMediaTypes) {
-            if (supportedMediaTypes[mediaType!] > selectedRank) {
+                if (mediaType != null && predicate(mediaType)) {
-                selectedMediaType = mediaType;
+                    return mediaType;
-                selectedRank = supportedMediaTypes[mediaType!];
+                }
             }
         }
 
-        if (selectedMediaType === undefined) {
+        throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-            throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-        }
-
-        return selectedMediaType!;
     }
 
     /**
      * Convert data to a string according the given media type
      */
     public static stringify(data: any, mediaType: string): string {
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return String(data);
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.stringify(data);
         }
 
@@ -237,18 +275,14 @@ export class ObjectSerializer {
             throw new Error("Cannot parse content. No Content-Type defined.");
         }
 
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return rawData;
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.parse(rawData);
         }
 
-        if (mediaType === "text/html") {
-            return rawData;
-        }
-
         throw new Error("The mediaType " + mediaType + " is not supported by ObjectSerializer.parse.");
     }
 }

samples/openapi3/client/petstore/typescript/builds/default/models/ObjectSerializer.ts

@@ -24,16 +24,6 @@ let primitives = [
                     "any"
                  ];
 
-const supportedMediaTypes: { [mediaType: string]: number } = {
-  "application/json": Infinity,
-  "application/json-patch+json": 1,
-  "application/merge-patch+json": 1,
-  "application/strategic-merge-patch+json": 1,
-  "application/octet-stream": 0,
-  "application/x-www-form-urlencoded": 0
-}
-
-
 let enumsMap: Set<string> = new Set<string>([
     "OrderStatusEnum",
     "PetStatusEnum",
@@ -48,6 +38,58 @@ let typeMap: {[index: string]: any} = {
     "User": User,
 }
 
+type MimeTypeDescriptor = {
+    type: string;
+    subtype: string;
+    subtypeTokens: string[];
+};
+
+/**
+ * Every mime-type consists of a type, subtype, and optional parameters.
+ * The subtype can be composite, including information about the content format.
+ * For example: `application/json-patch+json`, `application/merge-patch+json`.
+ *
+ * This helper transforms a string mime-type into an internal representation.
+ * This simplifies the implementation of predicates that in turn define common rules for parsing or stringifying
+ * the payload.
+ */
+const parseMimeType = (mimeType: string): MimeTypeDescriptor => {
+    const [type, subtype] = mimeType.split('/');
+    return {
+        type,
+        subtype,
+        subtypeTokens: subtype.split('+'),
+    };
+};
+
+type MimeTypePredicate = (mimeType: string) => boolean;
+
+// This factory creates a predicate function that checks a string mime-type against defined rules.
+const mimeTypePredicateFactory = (predicate: (descriptor: MimeTypeDescriptor) => boolean): MimeTypePredicate => (mimeType) => predicate(parseMimeType(mimeType));
+
+// Use this factory when you need to define a simple predicate based only on type and, if applicable, subtype.
+const mimeTypeSimplePredicateFactory = (type: string, subtype?: string): MimeTypePredicate => mimeTypePredicateFactory((descriptor) => {
+    if (descriptor.type !== type) return false;
+    if (subtype != null && descriptor.subtype !== subtype) return false;
+    return true;
+});
+
+// Creating a set of named predicates that will help us determine how to handle different mime-types
+const isTextLikeMimeType = mimeTypeSimplePredicateFactory('text');
+const isJsonMimeType = mimeTypeSimplePredicateFactory('application', 'json');
+const isJsonLikeMimeType = mimeTypePredicateFactory((descriptor) => descriptor.type === 'application' && descriptor.subtypeTokens.some((item) => item === 'json'));
+const isOctetStreamMimeType = mimeTypeSimplePredicateFactory('application', 'octet-stream');
+const isFormUrlencodedMimeType = mimeTypeSimplePredicateFactory('application', 'x-www-form-urlencoded');
+
+// Defining a list of mime-types in the order of prioritization for handling.
+const supportedMimeTypePredicatesWithPriority: MimeTypePredicate[] = [
+    isJsonMimeType,
+    isJsonLikeMimeType,
+    isTextLikeMimeType,
+    isOctetStreamMimeType,
+    isFormUrlencodedMimeType,
+];
+
 export class ObjectSerializer {
     public static findCorrectType(data: any, expectedType: string) {
         if (data == undefined) {
@@ -193,31 +235,27 @@ export class ObjectSerializer {
         }
 
         const normalMediaTypes = mediaTypes.map(this.normalizeMediaType);
-        let selectedMediaType: string | undefined = undefined;
+
-        let selectedRank: number = -Infinity;
+        for (const predicate of supportedMimeTypePredicatesWithPriority) {
-        for (const mediaType of normalMediaTypes) {
+            for (const mediaType of normalMediaTypes) {
-            if (supportedMediaTypes[mediaType!] > selectedRank) {
+                if (mediaType != null && predicate(mediaType)) {
-                selectedMediaType = mediaType;
+                    return mediaType;
-                selectedRank = supportedMediaTypes[mediaType!];
+                }
             }
         }
 
-        if (selectedMediaType === undefined) {
+        throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-            throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-        }
-
-        return selectedMediaType!;
     }
 
     /**
      * Convert data to a string according the given media type
      */
     public static stringify(data: any, mediaType: string): string {
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return String(data);
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.stringify(data);
         }
 
@@ -232,18 +270,14 @@ export class ObjectSerializer {
             throw new Error("Cannot parse content. No Content-Type defined.");
         }
 
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return rawData;
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.parse(rawData);
         }
 
-        if (mediaType === "text/html") {
-            return rawData;
-        }
-
         throw new Error("The mediaType " + mediaType + " is not supported by ObjectSerializer.parse.");
     }
 }

samples/openapi3/client/petstore/typescript/builds/deno/models/ObjectSerializer.ts

@@ -24,16 +24,6 @@ let primitives = [
                     "any"
                  ];
 
-const supportedMediaTypes: { [mediaType: string]: number } = {
-  "application/json": Infinity,
-  "application/json-patch+json": 1,
-  "application/merge-patch+json": 1,
-  "application/strategic-merge-patch+json": 1,
-  "application/octet-stream": 0,
-  "application/x-www-form-urlencoded": 0
-}
-
-
 let enumsMap: Set<string> = new Set<string>([
     "OrderStatusEnum",
     "PetStatusEnum",
@@ -48,6 +38,58 @@ let typeMap: {[index: string]: any} = {
     "User": User,
 }
 
+type MimeTypeDescriptor = {
+    type: string;
+    subtype: string;
+    subtypeTokens: string[];
+};
+
+/**
+ * Every mime-type consists of a type, subtype, and optional parameters.
+ * The subtype can be composite, including information about the content format.
+ * For example: `application/json-patch+json`, `application/merge-patch+json`.
+ *
+ * This helper transforms a string mime-type into an internal representation.
+ * This simplifies the implementation of predicates that in turn define common rules for parsing or stringifying
+ * the payload.
+ */
+const parseMimeType = (mimeType: string): MimeTypeDescriptor => {
+    const [type, subtype] = mimeType.split('/');
+    return {
+        type,
+        subtype,
+        subtypeTokens: subtype.split('+'),
+    };
+};
+
+type MimeTypePredicate = (mimeType: string) => boolean;
+
+// This factory creates a predicate function that checks a string mime-type against defined rules.
+const mimeTypePredicateFactory = (predicate: (descriptor: MimeTypeDescriptor) => boolean): MimeTypePredicate => (mimeType) => predicate(parseMimeType(mimeType));
+
+// Use this factory when you need to define a simple predicate based only on type and, if applicable, subtype.
+const mimeTypeSimplePredicateFactory = (type: string, subtype?: string): MimeTypePredicate => mimeTypePredicateFactory((descriptor) => {
+    if (descriptor.type !== type) return false;
+    if (subtype != null && descriptor.subtype !== subtype) return false;
+    return true;
+});
+
+// Creating a set of named predicates that will help us determine how to handle different mime-types
+const isTextLikeMimeType = mimeTypeSimplePredicateFactory('text');
+const isJsonMimeType = mimeTypeSimplePredicateFactory('application', 'json');
+const isJsonLikeMimeType = mimeTypePredicateFactory((descriptor) => descriptor.type === 'application' && descriptor.subtypeTokens.some((item) => item === 'json'));
+const isOctetStreamMimeType = mimeTypeSimplePredicateFactory('application', 'octet-stream');
+const isFormUrlencodedMimeType = mimeTypeSimplePredicateFactory('application', 'x-www-form-urlencoded');
+
+// Defining a list of mime-types in the order of prioritization for handling.
+const supportedMimeTypePredicatesWithPriority: MimeTypePredicate[] = [
+    isJsonMimeType,
+    isJsonLikeMimeType,
+    isTextLikeMimeType,
+    isOctetStreamMimeType,
+    isFormUrlencodedMimeType,
+];
+
 export class ObjectSerializer {
     public static findCorrectType(data: any, expectedType: string) {
         if (data == undefined) {
@@ -193,31 +235,27 @@ export class ObjectSerializer {
         }
 
         const normalMediaTypes = mediaTypes.map(this.normalizeMediaType);
-        let selectedMediaType: string | undefined = undefined;
+
-        let selectedRank: number = -Infinity;
+        for (const predicate of supportedMimeTypePredicatesWithPriority) {
-        for (const mediaType of normalMediaTypes) {
+            for (const mediaType of normalMediaTypes) {
-            if (supportedMediaTypes[mediaType!] > selectedRank) {
+                if (mediaType != null && predicate(mediaType)) {
-                selectedMediaType = mediaType;
+                    return mediaType;
-                selectedRank = supportedMediaTypes[mediaType!];
+                }
             }
         }
 
-        if (selectedMediaType === undefined) {
+        throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-            throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-        }
-
-        return selectedMediaType!;
     }
 
     /**
      * Convert data to a string according the given media type
      */
     public static stringify(data: any, mediaType: string): string {
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return String(data);
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.stringify(data);
         }
 
@@ -232,18 +270,14 @@ export class ObjectSerializer {
             throw new Error("Cannot parse content. No Content-Type defined.");
         }
 
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return rawData;
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.parse(rawData);
         }
 
-        if (mediaType === "text/html") {
-            return rawData;
-        }
-
         throw new Error("The mediaType " + mediaType + " is not supported by ObjectSerializer.parse.");
     }
 }

samples/openapi3/client/petstore/typescript/builds/inversify/models/ObjectSerializer.ts

@@ -24,16 +24,6 @@ let primitives = [
                     "any"
                  ];
 
-const supportedMediaTypes: { [mediaType: string]: number } = {
-  "application/json": Infinity,
-  "application/json-patch+json": 1,
-  "application/merge-patch+json": 1,
-  "application/strategic-merge-patch+json": 1,
-  "application/octet-stream": 0,
-  "application/x-www-form-urlencoded": 0
-}
-
-
 let enumsMap: Set<string> = new Set<string>([
     "OrderStatusEnum",
     "PetStatusEnum",
@@ -48,6 +38,58 @@ let typeMap: {[index: string]: any} = {
     "User": User,
 }
 
+type MimeTypeDescriptor = {
+    type: string;
+    subtype: string;
+    subtypeTokens: string[];
+};
+
+/**
+ * Every mime-type consists of a type, subtype, and optional parameters.
+ * The subtype can be composite, including information about the content format.
+ * For example: `application/json-patch+json`, `application/merge-patch+json`.
+ *
+ * This helper transforms a string mime-type into an internal representation.
+ * This simplifies the implementation of predicates that in turn define common rules for parsing or stringifying
+ * the payload.
+ */
+const parseMimeType = (mimeType: string): MimeTypeDescriptor => {
+    const [type, subtype] = mimeType.split('/');
+    return {
+        type,
+        subtype,
+        subtypeTokens: subtype.split('+'),
+    };
+};
+
+type MimeTypePredicate = (mimeType: string) => boolean;
+
+// This factory creates a predicate function that checks a string mime-type against defined rules.
+const mimeTypePredicateFactory = (predicate: (descriptor: MimeTypeDescriptor) => boolean): MimeTypePredicate => (mimeType) => predicate(parseMimeType(mimeType));
+
+// Use this factory when you need to define a simple predicate based only on type and, if applicable, subtype.
+const mimeTypeSimplePredicateFactory = (type: string, subtype?: string): MimeTypePredicate => mimeTypePredicateFactory((descriptor) => {
+    if (descriptor.type !== type) return false;
+    if (subtype != null && descriptor.subtype !== subtype) return false;
+    return true;
+});
+
+// Creating a set of named predicates that will help us determine how to handle different mime-types
+const isTextLikeMimeType = mimeTypeSimplePredicateFactory('text');
+const isJsonMimeType = mimeTypeSimplePredicateFactory('application', 'json');
+const isJsonLikeMimeType = mimeTypePredicateFactory((descriptor) => descriptor.type === 'application' && descriptor.subtypeTokens.some((item) => item === 'json'));
+const isOctetStreamMimeType = mimeTypeSimplePredicateFactory('application', 'octet-stream');
+const isFormUrlencodedMimeType = mimeTypeSimplePredicateFactory('application', 'x-www-form-urlencoded');
+
+// Defining a list of mime-types in the order of prioritization for handling.
+const supportedMimeTypePredicatesWithPriority: MimeTypePredicate[] = [
+    isJsonMimeType,
+    isJsonLikeMimeType,
+    isTextLikeMimeType,
+    isOctetStreamMimeType,
+    isFormUrlencodedMimeType,
+];
+
 export class ObjectSerializer {
     public static findCorrectType(data: any, expectedType: string) {
         if (data == undefined) {
@@ -193,31 +235,27 @@ export class ObjectSerializer {
         }
 
         const normalMediaTypes = mediaTypes.map(this.normalizeMediaType);
-        let selectedMediaType: string | undefined = undefined;
+
-        let selectedRank: number = -Infinity;
+        for (const predicate of supportedMimeTypePredicatesWithPriority) {
-        for (const mediaType of normalMediaTypes) {
+            for (const mediaType of normalMediaTypes) {
-            if (supportedMediaTypes[mediaType!] > selectedRank) {
+                if (mediaType != null && predicate(mediaType)) {
-                selectedMediaType = mediaType;
+                    return mediaType;
-                selectedRank = supportedMediaTypes[mediaType!];
+                }
             }
         }
 
-        if (selectedMediaType === undefined) {
+        throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-            throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-        }
-
-        return selectedMediaType!;
     }
 
     /**
      * Convert data to a string according the given media type
      */
     public static stringify(data: any, mediaType: string): string {
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return String(data);
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.stringify(data);
         }
 
@@ -232,18 +270,14 @@ export class ObjectSerializer {
             throw new Error("Cannot parse content. No Content-Type defined.");
         }
 
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return rawData;
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.parse(rawData);
         }
 
-        if (mediaType === "text/html") {
-            return rawData;
-        }
-
         throw new Error("The mediaType " + mediaType + " is not supported by ObjectSerializer.parse.");
     }
 }

samples/openapi3/client/petstore/typescript/builds/jquery/models/ObjectSerializer.ts

@@ -24,16 +24,6 @@ let primitives = [
                     "any"
                  ];
 
-const supportedMediaTypes: { [mediaType: string]: number } = {
-  "application/json": Infinity,
-  "application/json-patch+json": 1,
-  "application/merge-patch+json": 1,
-  "application/strategic-merge-patch+json": 1,
-  "application/octet-stream": 0,
-  "application/x-www-form-urlencoded": 0
-}
-
-
 let enumsMap: Set<string> = new Set<string>([
     "OrderStatusEnum",
     "PetStatusEnum",
@@ -48,6 +38,58 @@ let typeMap: {[index: string]: any} = {
     "User": User,
 }
 
+type MimeTypeDescriptor = {
+    type: string;
+    subtype: string;
+    subtypeTokens: string[];
+};
+
+/**
+ * Every mime-type consists of a type, subtype, and optional parameters.
+ * The subtype can be composite, including information about the content format.
+ * For example: `application/json-patch+json`, `application/merge-patch+json`.
+ *
+ * This helper transforms a string mime-type into an internal representation.
+ * This simplifies the implementation of predicates that in turn define common rules for parsing or stringifying
+ * the payload.
+ */
+const parseMimeType = (mimeType: string): MimeTypeDescriptor => {
+    const [type, subtype] = mimeType.split('/');
+    return {
+        type,
+        subtype,
+        subtypeTokens: subtype.split('+'),
+    };
+};
+
+type MimeTypePredicate = (mimeType: string) => boolean;
+
+// This factory creates a predicate function that checks a string mime-type against defined rules.
+const mimeTypePredicateFactory = (predicate: (descriptor: MimeTypeDescriptor) => boolean): MimeTypePredicate => (mimeType) => predicate(parseMimeType(mimeType));
+
+// Use this factory when you need to define a simple predicate based only on type and, if applicable, subtype.
+const mimeTypeSimplePredicateFactory = (type: string, subtype?: string): MimeTypePredicate => mimeTypePredicateFactory((descriptor) => {
+    if (descriptor.type !== type) return false;
+    if (subtype != null && descriptor.subtype !== subtype) return false;
+    return true;
+});
+
+// Creating a set of named predicates that will help us determine how to handle different mime-types
+const isTextLikeMimeType = mimeTypeSimplePredicateFactory('text');
+const isJsonMimeType = mimeTypeSimplePredicateFactory('application', 'json');
+const isJsonLikeMimeType = mimeTypePredicateFactory((descriptor) => descriptor.type === 'application' && descriptor.subtypeTokens.some((item) => item === 'json'));
+const isOctetStreamMimeType = mimeTypeSimplePredicateFactory('application', 'octet-stream');
+const isFormUrlencodedMimeType = mimeTypeSimplePredicateFactory('application', 'x-www-form-urlencoded');
+
+// Defining a list of mime-types in the order of prioritization for handling.
+const supportedMimeTypePredicatesWithPriority: MimeTypePredicate[] = [
+    isJsonMimeType,
+    isJsonLikeMimeType,
+    isTextLikeMimeType,
+    isOctetStreamMimeType,
+    isFormUrlencodedMimeType,
+];
+
 export class ObjectSerializer {
     public static findCorrectType(data: any, expectedType: string) {
         if (data == undefined) {
@@ -193,31 +235,27 @@ export class ObjectSerializer {
         }
 
         const normalMediaTypes = mediaTypes.map(this.normalizeMediaType);
-        let selectedMediaType: string | undefined = undefined;
+
-        let selectedRank: number = -Infinity;
+        for (const predicate of supportedMimeTypePredicatesWithPriority) {
-        for (const mediaType of normalMediaTypes) {
+            for (const mediaType of normalMediaTypes) {
-            if (supportedMediaTypes[mediaType!] > selectedRank) {
+                if (mediaType != null && predicate(mediaType)) {
-                selectedMediaType = mediaType;
+                    return mediaType;
-                selectedRank = supportedMediaTypes[mediaType!];
+                }
             }
         }
 
-        if (selectedMediaType === undefined) {
+        throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-            throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-        }
-
-        return selectedMediaType!;
     }
 
     /**
      * Convert data to a string according the given media type
      */
     public static stringify(data: any, mediaType: string): string {
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return String(data);
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.stringify(data);
         }
 
@@ -232,18 +270,14 @@ export class ObjectSerializer {
             throw new Error("Cannot parse content. No Content-Type defined.");
         }
 
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return rawData;
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.parse(rawData);
         }
 
-        if (mediaType === "text/html") {
-            return rawData;
-        }
-
         throw new Error("The mediaType " + mediaType + " is not supported by ObjectSerializer.parse.");
     }
 }

samples/openapi3/client/petstore/typescript/builds/object_params/models/ObjectSerializer.ts

@@ -24,16 +24,6 @@ let primitives = [
                     "any"
                  ];
 
-const supportedMediaTypes: { [mediaType: string]: number } = {
-  "application/json": Infinity,
-  "application/json-patch+json": 1,
-  "application/merge-patch+json": 1,
-  "application/strategic-merge-patch+json": 1,
-  "application/octet-stream": 0,
-  "application/x-www-form-urlencoded": 0
-}
-
-
 let enumsMap: Set<string> = new Set<string>([
     "OrderStatusEnum",
     "PetStatusEnum",
@@ -48,6 +38,58 @@ let typeMap: {[index: string]: any} = {
     "User": User,
 }
 
+type MimeTypeDescriptor = {
+    type: string;
+    subtype: string;
+    subtypeTokens: string[];
+};
+
+/**
+ * Every mime-type consists of a type, subtype, and optional parameters.
+ * The subtype can be composite, including information about the content format.
+ * For example: `application/json-patch+json`, `application/merge-patch+json`.
+ *
+ * This helper transforms a string mime-type into an internal representation.
+ * This simplifies the implementation of predicates that in turn define common rules for parsing or stringifying
+ * the payload.
+ */
+const parseMimeType = (mimeType: string): MimeTypeDescriptor => {
+    const [type, subtype] = mimeType.split('/');
+    return {
+        type,
+        subtype,
+        subtypeTokens: subtype.split('+'),
+    };
+};
+
+type MimeTypePredicate = (mimeType: string) => boolean;
+
+// This factory creates a predicate function that checks a string mime-type against defined rules.
+const mimeTypePredicateFactory = (predicate: (descriptor: MimeTypeDescriptor) => boolean): MimeTypePredicate => (mimeType) => predicate(parseMimeType(mimeType));
+
+// Use this factory when you need to define a simple predicate based only on type and, if applicable, subtype.
+const mimeTypeSimplePredicateFactory = (type: string, subtype?: string): MimeTypePredicate => mimeTypePredicateFactory((descriptor) => {
+    if (descriptor.type !== type) return false;
+    if (subtype != null && descriptor.subtype !== subtype) return false;
+    return true;
+});
+
+// Creating a set of named predicates that will help us determine how to handle different mime-types
+const isTextLikeMimeType = mimeTypeSimplePredicateFactory('text');
+const isJsonMimeType = mimeTypeSimplePredicateFactory('application', 'json');
+const isJsonLikeMimeType = mimeTypePredicateFactory((descriptor) => descriptor.type === 'application' && descriptor.subtypeTokens.some((item) => item === 'json'));
+const isOctetStreamMimeType = mimeTypeSimplePredicateFactory('application', 'octet-stream');
+const isFormUrlencodedMimeType = mimeTypeSimplePredicateFactory('application', 'x-www-form-urlencoded');
+
+// Defining a list of mime-types in the order of prioritization for handling.
+const supportedMimeTypePredicatesWithPriority: MimeTypePredicate[] = [
+    isJsonMimeType,
+    isJsonLikeMimeType,
+    isTextLikeMimeType,
+    isOctetStreamMimeType,
+    isFormUrlencodedMimeType,
+];
+
 export class ObjectSerializer {
     public static findCorrectType(data: any, expectedType: string) {
         if (data == undefined) {
@@ -193,31 +235,27 @@ export class ObjectSerializer {
         }
 
         const normalMediaTypes = mediaTypes.map(this.normalizeMediaType);
-        let selectedMediaType: string | undefined = undefined;
+
-        let selectedRank: number = -Infinity;
+        for (const predicate of supportedMimeTypePredicatesWithPriority) {
-        for (const mediaType of normalMediaTypes) {
+            for (const mediaType of normalMediaTypes) {
-            if (supportedMediaTypes[mediaType!] > selectedRank) {
+                if (mediaType != null && predicate(mediaType)) {
-                selectedMediaType = mediaType;
+                    return mediaType;
-                selectedRank = supportedMediaTypes[mediaType!];
+                }
             }
         }
 
-        if (selectedMediaType === undefined) {
+        throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-            throw new Error("None of the given media types are supported: " + mediaTypes.join(", "));
-        }
-
-        return selectedMediaType!;
     }
 
     /**
      * Convert data to a string according the given media type
      */
     public static stringify(data: any, mediaType: string): string {
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return String(data);
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.stringify(data);
         }
 
@@ -232,18 +270,14 @@ export class ObjectSerializer {
             throw new Error("Cannot parse content. No Content-Type defined.");
         }
 
-        if (mediaType === "text/plain") {
+        if (isTextLikeMimeType(mediaType)) {
             return rawData;
         }
 
-        if (mediaType === "application/json" || mediaType === "application/json-patch+json" || mediaType === "application/merge-patch+json" || mediaType === "application/strategic-merge-patch+json") {
+        if (isJsonLikeMimeType(mediaType)) {
             return JSON.parse(rawData);
         }
 
-        if (mediaType === "text/html") {
-            return rawData;
-        }
-
         throw new Error("The mediaType " + mediaType + " is not supported by ObjectSerializer.parse.");
     }
 }

samples/openapi3/client/petstore/typescript/tests/default/test/models/ObjectSerializer.test.ts

@@ -7,6 +7,18 @@ const objectSerializerFile = rewire(__dirname + "/../../node_modules/ts-petstore
 
 const ObjectSerializer = objectSerializerFile.__get__("ObjectSerializer")
 
+const htmlContent = `
+<html>
+  <head>
+    <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+    <title>Error 404 Not Found</title>
+  </head>
+  <body>
+    <h2>HTTP ERROR 404</h2>
+    <p>Resource not found</p>
+  </body>
+</html>
+`;
 
 describe("ObjectSerializer", () => {
     describe("Serialize", () => {
@@ -231,10 +243,52 @@ describe("ObjectSerializer", () => {
             expect(deserialized).to.deep.equal(categories)
         })
     })
+
     describe("Parse", () => {
-        it("text/html", () => {
+        it("Text", () => {
-            const input = "<html>\n<head>\n<meta http-equiv=\"Content-Type\" content=\"text/html;charset=utf-8\"/>\n<title>Error 404 Not Found</title>\n</head>\n<body><h2>HTTP ERROR 404</h2>\n<p>Resource not found</p>\n</body>\n</html>\n"
+            expect(ObjectSerializer.parse("test", "text/plain")).to.equal("test")
-            expect(ObjectSerializer.parse(input, "text/html")).to.equal(input)
+            expect(ObjectSerializer.parse(htmlContent, "text/html")).to.equal(htmlContent)
+        });
+
+        it("JSON", () => {
+            const jsonContent = { foo: "bar"};
+
+            expect(ObjectSerializer.parse(JSON.stringify(jsonContent), "application/json")).to.deep.equal(jsonContent)
+            expect(ObjectSerializer.parse(JSON.stringify(jsonContent), "application/json-patch+json")).to.deep.equal(jsonContent)
+            expect(ObjectSerializer.parse(JSON.stringify(jsonContent), "application/merge-patch+json")).to.deep.equal(jsonContent)
+        });
+    })
+
+    describe("Stringify", () => {
+        it("Text", () => {
+            expect(ObjectSerializer.stringify("test", "text/plain")).to.equal("test")
+            expect(ObjectSerializer.stringify(htmlContent, "text/html")).to.equal(htmlContent)
+        });
+
+        it("JSON", () => {
+            const jsonContent = { foo: "bar"};
+
+            expect(ObjectSerializer.stringify(jsonContent, "application/json")).to.equal(JSON.stringify(jsonContent))
+            expect(ObjectSerializer.stringify(jsonContent, "application/json-patch+json")).to.equal(JSON.stringify(jsonContent))
+            expect(ObjectSerializer.stringify(jsonContent, "application/merge-patch+json")).to.equal(JSON.stringify(jsonContent))
+        });
+    })
+
+    describe("GetPreferredMediaType", () => {
+        it("Empty media-type", () => {
+            expect(ObjectSerializer.getPreferredMediaType([])).to.equal("application/json")
+        });
+
+        it("JSON media-type", () => {
+            expect(ObjectSerializer.getPreferredMediaType(["application/json"])).to.equal("application/json")
+        });
+
+        it("Multiple media-types", () => {
+            expect(ObjectSerializer.getPreferredMediaType(["text/plain", "application/x-www-form-urlencoded", "application/json"])).to.equal("application/json")
+        });
+
+        it("Unsupported media-type", () => {
+            expect(() => ObjectSerializer.getPreferredMediaType(["foo/bar"])).to.throw('None of the given media types are supported: foo/bar')
         });
     })
 })