diff --git a/modules/openapi-generator/src/main/resources/typescript-axios/apiInner.mustache b/modules/openapi-generator/src/main/resources/typescript-axios/apiInner.mustache
index 36f29be6f68..7e776e3f2ea 100644
--- a/modules/openapi-generator/src/main/resources/typescript-axios/apiInner.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript-axios/apiInner.mustache
@@ -193,7 +193,7 @@ export const {{classname}}AxiosParamCreator = function (configuration?: Configur
             localVarRequestOptions.data = localVarFormParams{{#vendorExtensions}}{{^multipartFormData}}.toString(){{/multipartFormData}}{{/vendorExtensions}};
     {{/hasFormParams}}
     {{#bodyParam}}
-            const needsSerialization = (<any>"{{dataType}}" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof {{paramName}} !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify({{paramName}} !== undefined ? {{paramName}} : {}) : ({{paramName}} || "");
     {{/bodyParam}}
 
diff --git a/samples/client/petstore/typescript-axios/builds/default/api.ts b/samples/client/petstore/typescript-axios/builds/default/api.ts
index 3d4ced41f5a..b5d44c028e2 100644
--- a/samples/client/petstore/typescript-axios/builds/default/api.ts
+++ b/samples/client/petstore/typescript-axios/builds/default/api.ts
@@ -292,7 +292,7 @@ export const PetApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Pet" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -525,7 +525,7 @@ export const PetApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Pet" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1126,7 +1126,7 @@ export const StoreApiAxiosParamCreator = function (configuration?: Configuration
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Order" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1342,7 +1342,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"User" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1380,7 +1380,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Array&lt;User&gt;" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1418,7 +1418,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Array&lt;User&gt;" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1608,7 +1608,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"User" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
diff --git a/samples/client/petstore/typescript-axios/builds/es6-target/api.ts b/samples/client/petstore/typescript-axios/builds/es6-target/api.ts
index 3d4ced41f5a..b5d44c028e2 100644
--- a/samples/client/petstore/typescript-axios/builds/es6-target/api.ts
+++ b/samples/client/petstore/typescript-axios/builds/es6-target/api.ts
@@ -292,7 +292,7 @@ export const PetApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Pet" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -525,7 +525,7 @@ export const PetApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Pet" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1126,7 +1126,7 @@ export const StoreApiAxiosParamCreator = function (configuration?: Configuration
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Order" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1342,7 +1342,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"User" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1380,7 +1380,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Array&lt;User&gt;" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1418,7 +1418,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Array&lt;User&gt;" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1608,7 +1608,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"User" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
diff --git a/samples/client/petstore/typescript-axios/builds/with-complex-headers/api.ts b/samples/client/petstore/typescript-axios/builds/with-complex-headers/api.ts
index 7658f361653..e4e2a763dc6 100644
--- a/samples/client/petstore/typescript-axios/builds/with-complex-headers/api.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-complex-headers/api.ts
@@ -341,7 +341,7 @@ export const PetApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Pet" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof pet !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(pet !== undefined ? pet : {}) : (pet || "");
 
             return {
@@ -574,7 +574,7 @@ export const PetApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Pet" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof pet !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(pet !== undefined ? pet : {}) : (pet || "");
 
             return {
@@ -1181,7 +1181,7 @@ export const StoreApiAxiosParamCreator = function (configuration?: Configuration
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Order" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof order !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(order !== undefined ? order : {}) : (order || "");
 
             return {
@@ -1397,7 +1397,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"User" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof user !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(user !== undefined ? user : {}) : (user || "");
 
             return {
@@ -1435,7 +1435,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Array&lt;User&gt;" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof user !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(user !== undefined ? user : {}) : (user || "");
 
             return {
@@ -1473,7 +1473,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Array&lt;User&gt;" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof user !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(user !== undefined ? user : {}) : (user || "");
 
             return {
@@ -1663,7 +1663,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"User" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof user !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(user !== undefined ? user : {}) : (user || "");
 
             return {
diff --git a/samples/client/petstore/typescript-axios/builds/with-interfaces/api.ts b/samples/client/petstore/typescript-axios/builds/with-interfaces/api.ts
index a6acb17b1c8..691bb79fb62 100644
--- a/samples/client/petstore/typescript-axios/builds/with-interfaces/api.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-interfaces/api.ts
@@ -292,7 +292,7 @@ export const PetApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Pet" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -525,7 +525,7 @@ export const PetApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Pet" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1219,7 +1219,7 @@ export const StoreApiAxiosParamCreator = function (configuration?: Configuration
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Order" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1482,7 +1482,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"User" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1520,7 +1520,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Array&lt;User&gt;" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1558,7 +1558,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Array&lt;User&gt;" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1748,7 +1748,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"User" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
diff --git a/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/api/another/level/pet-api.ts b/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/api/another/level/pet-api.ts
index a2d92d88e15..70d3de8c013 100644
--- a/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/api/another/level/pet-api.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/api/another/level/pet-api.ts
@@ -67,7 +67,7 @@ export const PetApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Pet" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -300,7 +300,7 @@ export const PetApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Pet" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
diff --git a/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/api/another/level/store-api.ts b/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/api/another/level/store-api.ts
index 4ba4f4c122d..af5fe4057ec 100644
--- a/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/api/another/level/store-api.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/api/another/level/store-api.ts
@@ -164,7 +164,7 @@ export const StoreApiAxiosParamCreator = function (configuration?: Configuration
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Order" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
diff --git a/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/api/another/level/user-api.ts b/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/api/another/level/user-api.ts
index a0122ec1107..f2a432b5d1f 100644
--- a/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/api/another/level/user-api.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/api/another/level/user-api.ts
@@ -57,7 +57,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"User" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -95,7 +95,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Array&lt;User&gt;" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -133,7 +133,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Array&lt;User&gt;" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -323,7 +323,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"User" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
diff --git a/samples/client/petstore/typescript-axios/builds/with-npm-version/api.ts b/samples/client/petstore/typescript-axios/builds/with-npm-version/api.ts
index 3d4ced41f5a..b5d44c028e2 100644
--- a/samples/client/petstore/typescript-axios/builds/with-npm-version/api.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-npm-version/api.ts
@@ -292,7 +292,7 @@ export const PetApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Pet" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -525,7 +525,7 @@ export const PetApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Pet" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1126,7 +1126,7 @@ export const StoreApiAxiosParamCreator = function (configuration?: Configuration
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Order" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1342,7 +1342,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"User" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1380,7 +1380,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Array&lt;User&gt;" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1418,7 +1418,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"Array&lt;User&gt;" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {
@@ -1608,7 +1608,7 @@ export const UserApiAxiosParamCreator = function (configuration?: Configuration)
             // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
             delete localVarUrlObj.search;
             localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};
-            const needsSerialization = (<any>"User" !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
+            const needsSerialization = (typeof body !== "string") || localVarRequestOptions.headers['Content-Type'] === 'application/json';
             localVarRequestOptions.data =  needsSerialization ? JSON.stringify(body !== undefined ? body : {}) : (body || "");
 
             return {