diff --git a/modules/openapi-generator/src/main/resources/typescript-axios/common.mustache b/modules/openapi-generator/src/main/resources/typescript-axios/common.mustache
index 114bb3e92f2..e9a2378002f 100644
--- a/modules/openapi-generator/src/main/resources/typescript-axios/common.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript-axios/common.mustache
@@ -75,24 +75,34 @@ export const setOAuthToObject = async function (object: any, name: string, scope
     }
 }
 
+function setFlattenedQueryParams(urlSearchParams: URLSearchParams, parameter: any, key: string = ""): void {
+    if (typeof parameter === "object") {
+        if (Array.isArray(parameter)) {
+            (parameter as any[]).forEach(item => setFlattenedQueryParams(urlSearchParams, item, key));
+        } 
+        else {
+            Object.keys(parameter).forEach(currentKey => 
+                setFlattenedQueryParams(urlSearchParams, parameter[currentKey], `${key}.${currentKey}`)
+            );
+        }
+    } 
+    else {
+        if (urlSearchParams.has(key)) {
+            urlSearchParams.append(key, parameter);
+        } 
+        else {
+            urlSearchParams.set(key, parameter);
+        }
+    }
+}
+
 /**
  *
  * @export
  */
 export const setSearchParams = function (url: URL, ...objects: any[]) {
     const searchParams = new URLSearchParams(url.search);
-    for (const object of objects) {
-        for (const key in object) {
-            if (Array.isArray(object[key])) {
-                searchParams.delete(key);
-                for (const item of object[key]) {
-                    searchParams.append(key, item);
-                }
-            } else {
-                searchParams.set(key, object[key]);
-            }
-        }
-    }
+    setFlattenedQueryParams(searchParams, objects);
     url.search = searchParams.toString();
 }
 
diff --git a/samples/client/petstore/typescript-axios/builds/composed-schemas/common.ts b/samples/client/petstore/typescript-axios/builds/composed-schemas/common.ts
index b156f3e26e9..511e05e6b18 100644
--- a/samples/client/petstore/typescript-axios/builds/composed-schemas/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/composed-schemas/common.ts
@@ -83,24 +83,34 @@ export const setOAuthToObject = async function (object: any, name: string, scope
     }
 }
 
+function setFlattenedQueryParams(urlSearchParams: URLSearchParams, parameter: any, key: string = ""): void {
+    if (typeof parameter === "object") {
+        if (Array.isArray(parameter)) {
+            (parameter as any[]).forEach(item => setFlattenedQueryParams(urlSearchParams, item, key));
+        } 
+        else {
+            Object.keys(parameter).forEach(currentKey => 
+                setFlattenedQueryParams(urlSearchParams, parameter[currentKey], `${key}.${currentKey}`)
+            );
+        }
+    } 
+    else {
+        if (urlSearchParams.has(key)) {
+            urlSearchParams.append(key, parameter);
+        } 
+        else {
+            urlSearchParams.set(key, parameter);
+        }
+    }
+}
+
 /**
  *
  * @export
  */
 export const setSearchParams = function (url: URL, ...objects: any[]) {
     const searchParams = new URLSearchParams(url.search);
-    for (const object of objects) {
-        for (const key in object) {
-            if (Array.isArray(object[key])) {
-                searchParams.delete(key);
-                for (const item of object[key]) {
-                    searchParams.append(key, item);
-                }
-            } else {
-                searchParams.set(key, object[key]);
-            }
-        }
-    }
+    setFlattenedQueryParams(searchParams, objects);
     url.search = searchParams.toString();
 }
 
diff --git a/samples/client/petstore/typescript-axios/builds/default/common.ts b/samples/client/petstore/typescript-axios/builds/default/common.ts
index 1b1d3a4b7ae..37c079770b7 100644
--- a/samples/client/petstore/typescript-axios/builds/default/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/default/common.ts
@@ -83,24 +83,34 @@ export const setOAuthToObject = async function (object: any, name: string, scope
     }
 }
 
+function setFlattenedQueryParams(urlSearchParams: URLSearchParams, parameter: any, key: string = ""): void {
+    if (typeof parameter === "object") {
+        if (Array.isArray(parameter)) {
+            (parameter as any[]).forEach(item => setFlattenedQueryParams(urlSearchParams, item, key));
+        } 
+        else {
+            Object.keys(parameter).forEach(currentKey => 
+                setFlattenedQueryParams(urlSearchParams, parameter[currentKey], `${key}.${currentKey}`)
+            );
+        }
+    } 
+    else {
+        if (urlSearchParams.has(key)) {
+            urlSearchParams.append(key, parameter);
+        } 
+        else {
+            urlSearchParams.set(key, parameter);
+        }
+    }
+}
+
 /**
  *
  * @export
  */
 export const setSearchParams = function (url: URL, ...objects: any[]) {
     const searchParams = new URLSearchParams(url.search);
-    for (const object of objects) {
-        for (const key in object) {
-            if (Array.isArray(object[key])) {
-                searchParams.delete(key);
-                for (const item of object[key]) {
-                    searchParams.append(key, item);
-                }
-            } else {
-                searchParams.set(key, object[key]);
-            }
-        }
-    }
+    setFlattenedQueryParams(searchParams, objects);
     url.search = searchParams.toString();
 }
 
diff --git a/samples/client/petstore/typescript-axios/builds/es6-target/common.ts b/samples/client/petstore/typescript-axios/builds/es6-target/common.ts
index 1b1d3a4b7ae..37c079770b7 100644
--- a/samples/client/petstore/typescript-axios/builds/es6-target/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/es6-target/common.ts
@@ -83,24 +83,34 @@ export const setOAuthToObject = async function (object: any, name: string, scope
     }
 }
 
+function setFlattenedQueryParams(urlSearchParams: URLSearchParams, parameter: any, key: string = ""): void {
+    if (typeof parameter === "object") {
+        if (Array.isArray(parameter)) {
+            (parameter as any[]).forEach(item => setFlattenedQueryParams(urlSearchParams, item, key));
+        } 
+        else {
+            Object.keys(parameter).forEach(currentKey => 
+                setFlattenedQueryParams(urlSearchParams, parameter[currentKey], `${key}.${currentKey}`)
+            );
+        }
+    } 
+    else {
+        if (urlSearchParams.has(key)) {
+            urlSearchParams.append(key, parameter);
+        } 
+        else {
+            urlSearchParams.set(key, parameter);
+        }
+    }
+}
+
 /**
  *
  * @export
  */
 export const setSearchParams = function (url: URL, ...objects: any[]) {
     const searchParams = new URLSearchParams(url.search);
-    for (const object of objects) {
-        for (const key in object) {
-            if (Array.isArray(object[key])) {
-                searchParams.delete(key);
-                for (const item of object[key]) {
-                    searchParams.append(key, item);
-                }
-            } else {
-                searchParams.set(key, object[key]);
-            }
-        }
-    }
+    setFlattenedQueryParams(searchParams, objects);
     url.search = searchParams.toString();
 }
 
diff --git a/samples/client/petstore/typescript-axios/builds/test-petstore/common.ts b/samples/client/petstore/typescript-axios/builds/test-petstore/common.ts
index 350af25683b..0ab2c9b4646 100644
--- a/samples/client/petstore/typescript-axios/builds/test-petstore/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/test-petstore/common.ts
@@ -83,24 +83,34 @@ export const setOAuthToObject = async function (object: any, name: string, scope
     }
 }
 
+function setFlattenedQueryParams(urlSearchParams: URLSearchParams, parameter: any, key: string = ""): void {
+    if (typeof parameter === "object") {
+        if (Array.isArray(parameter)) {
+            (parameter as any[]).forEach(item => setFlattenedQueryParams(urlSearchParams, item, key));
+        } 
+        else {
+            Object.keys(parameter).forEach(currentKey => 
+                setFlattenedQueryParams(urlSearchParams, parameter[currentKey], `${key}.${currentKey}`)
+            );
+        }
+    } 
+    else {
+        if (urlSearchParams.has(key)) {
+            urlSearchParams.append(key, parameter);
+        } 
+        else {
+            urlSearchParams.set(key, parameter);
+        }
+    }
+}
+
 /**
  *
  * @export
  */
 export const setSearchParams = function (url: URL, ...objects: any[]) {
     const searchParams = new URLSearchParams(url.search);
-    for (const object of objects) {
-        for (const key in object) {
-            if (Array.isArray(object[key])) {
-                searchParams.delete(key);
-                for (const item of object[key]) {
-                    searchParams.append(key, item);
-                }
-            } else {
-                searchParams.set(key, object[key]);
-            }
-        }
-    }
+    setFlattenedQueryParams(searchParams, objects);
     url.search = searchParams.toString();
 }
 
diff --git a/samples/client/petstore/typescript-axios/builds/with-complex-headers/common.ts b/samples/client/petstore/typescript-axios/builds/with-complex-headers/common.ts
index 1b1d3a4b7ae..37c079770b7 100644
--- a/samples/client/petstore/typescript-axios/builds/with-complex-headers/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-complex-headers/common.ts
@@ -83,24 +83,34 @@ export const setOAuthToObject = async function (object: any, name: string, scope
     }
 }
 
+function setFlattenedQueryParams(urlSearchParams: URLSearchParams, parameter: any, key: string = ""): void {
+    if (typeof parameter === "object") {
+        if (Array.isArray(parameter)) {
+            (parameter as any[]).forEach(item => setFlattenedQueryParams(urlSearchParams, item, key));
+        } 
+        else {
+            Object.keys(parameter).forEach(currentKey => 
+                setFlattenedQueryParams(urlSearchParams, parameter[currentKey], `${key}.${currentKey}`)
+            );
+        }
+    } 
+    else {
+        if (urlSearchParams.has(key)) {
+            urlSearchParams.append(key, parameter);
+        } 
+        else {
+            urlSearchParams.set(key, parameter);
+        }
+    }
+}
+
 /**
  *
  * @export
  */
 export const setSearchParams = function (url: URL, ...objects: any[]) {
     const searchParams = new URLSearchParams(url.search);
-    for (const object of objects) {
-        for (const key in object) {
-            if (Array.isArray(object[key])) {
-                searchParams.delete(key);
-                for (const item of object[key]) {
-                    searchParams.append(key, item);
-                }
-            } else {
-                searchParams.set(key, object[key]);
-            }
-        }
-    }
+    setFlattenedQueryParams(searchParams, objects);
     url.search = searchParams.toString();
 }
 
diff --git a/samples/client/petstore/typescript-axios/builds/with-fake-endpoints-models-for-testing-with-http-signature/common.ts b/samples/client/petstore/typescript-axios/builds/with-fake-endpoints-models-for-testing-with-http-signature/common.ts
index 350af25683b..0ab2c9b4646 100644
--- a/samples/client/petstore/typescript-axios/builds/with-fake-endpoints-models-for-testing-with-http-signature/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-fake-endpoints-models-for-testing-with-http-signature/common.ts
@@ -83,24 +83,34 @@ export const setOAuthToObject = async function (object: any, name: string, scope
     }
 }
 
+function setFlattenedQueryParams(urlSearchParams: URLSearchParams, parameter: any, key: string = ""): void {
+    if (typeof parameter === "object") {
+        if (Array.isArray(parameter)) {
+            (parameter as any[]).forEach(item => setFlattenedQueryParams(urlSearchParams, item, key));
+        } 
+        else {
+            Object.keys(parameter).forEach(currentKey => 
+                setFlattenedQueryParams(urlSearchParams, parameter[currentKey], `${key}.${currentKey}`)
+            );
+        }
+    } 
+    else {
+        if (urlSearchParams.has(key)) {
+            urlSearchParams.append(key, parameter);
+        } 
+        else {
+            urlSearchParams.set(key, parameter);
+        }
+    }
+}
+
 /**
  *
  * @export
  */
 export const setSearchParams = function (url: URL, ...objects: any[]) {
     const searchParams = new URLSearchParams(url.search);
-    for (const object of objects) {
-        for (const key in object) {
-            if (Array.isArray(object[key])) {
-                searchParams.delete(key);
-                for (const item of object[key]) {
-                    searchParams.append(key, item);
-                }
-            } else {
-                searchParams.set(key, object[key]);
-            }
-        }
-    }
+    setFlattenedQueryParams(searchParams, objects);
     url.search = searchParams.toString();
 }
 
diff --git a/samples/client/petstore/typescript-axios/builds/with-interfaces/common.ts b/samples/client/petstore/typescript-axios/builds/with-interfaces/common.ts
index 1b1d3a4b7ae..37c079770b7 100644
--- a/samples/client/petstore/typescript-axios/builds/with-interfaces/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-interfaces/common.ts
@@ -83,24 +83,34 @@ export const setOAuthToObject = async function (object: any, name: string, scope
     }
 }
 
+function setFlattenedQueryParams(urlSearchParams: URLSearchParams, parameter: any, key: string = ""): void {
+    if (typeof parameter === "object") {
+        if (Array.isArray(parameter)) {
+            (parameter as any[]).forEach(item => setFlattenedQueryParams(urlSearchParams, item, key));
+        } 
+        else {
+            Object.keys(parameter).forEach(currentKey => 
+                setFlattenedQueryParams(urlSearchParams, parameter[currentKey], `${key}.${currentKey}`)
+            );
+        }
+    } 
+    else {
+        if (urlSearchParams.has(key)) {
+            urlSearchParams.append(key, parameter);
+        } 
+        else {
+            urlSearchParams.set(key, parameter);
+        }
+    }
+}
+
 /**
  *
  * @export
  */
 export const setSearchParams = function (url: URL, ...objects: any[]) {
     const searchParams = new URLSearchParams(url.search);
-    for (const object of objects) {
-        for (const key in object) {
-            if (Array.isArray(object[key])) {
-                searchParams.delete(key);
-                for (const item of object[key]) {
-                    searchParams.append(key, item);
-                }
-            } else {
-                searchParams.set(key, object[key]);
-            }
-        }
-    }
+    setFlattenedQueryParams(searchParams, objects);
     url.search = searchParams.toString();
 }
 
diff --git a/samples/client/petstore/typescript-axios/builds/with-node-imports/common.ts b/samples/client/petstore/typescript-axios/builds/with-node-imports/common.ts
index 56fdbc9e251..05c568e7f16 100644
--- a/samples/client/petstore/typescript-axios/builds/with-node-imports/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-node-imports/common.ts
@@ -84,24 +84,34 @@ export const setOAuthToObject = async function (object: any, name: string, scope
     }
 }
 
+function setFlattenedQueryParams(urlSearchParams: URLSearchParams, parameter: any, key: string = ""): void {
+    if (typeof parameter === "object") {
+        if (Array.isArray(parameter)) {
+            (parameter as any[]).forEach(item => setFlattenedQueryParams(urlSearchParams, item, key));
+        } 
+        else {
+            Object.keys(parameter).forEach(currentKey => 
+                setFlattenedQueryParams(urlSearchParams, parameter[currentKey], `${key}.${currentKey}`)
+            );
+        }
+    } 
+    else {
+        if (urlSearchParams.has(key)) {
+            urlSearchParams.append(key, parameter);
+        } 
+        else {
+            urlSearchParams.set(key, parameter);
+        }
+    }
+}
+
 /**
  *
  * @export
  */
 export const setSearchParams = function (url: URL, ...objects: any[]) {
     const searchParams = new URLSearchParams(url.search);
-    for (const object of objects) {
-        for (const key in object) {
-            if (Array.isArray(object[key])) {
-                searchParams.delete(key);
-                for (const item of object[key]) {
-                    searchParams.append(key, item);
-                }
-            } else {
-                searchParams.set(key, object[key]);
-            }
-        }
-    }
+    setFlattenedQueryParams(searchParams, objects);
     url.search = searchParams.toString();
 }
 
diff --git a/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/common.ts b/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/common.ts
index 1b1d3a4b7ae..37c079770b7 100644
--- a/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-npm-version-and-separate-models-and-api/common.ts
@@ -83,24 +83,34 @@ export const setOAuthToObject = async function (object: any, name: string, scope
     }
 }
 
+function setFlattenedQueryParams(urlSearchParams: URLSearchParams, parameter: any, key: string = ""): void {
+    if (typeof parameter === "object") {
+        if (Array.isArray(parameter)) {
+            (parameter as any[]).forEach(item => setFlattenedQueryParams(urlSearchParams, item, key));
+        } 
+        else {
+            Object.keys(parameter).forEach(currentKey => 
+                setFlattenedQueryParams(urlSearchParams, parameter[currentKey], `${key}.${currentKey}`)
+            );
+        }
+    } 
+    else {
+        if (urlSearchParams.has(key)) {
+            urlSearchParams.append(key, parameter);
+        } 
+        else {
+            urlSearchParams.set(key, parameter);
+        }
+    }
+}
+
 /**
  *
  * @export
  */
 export const setSearchParams = function (url: URL, ...objects: any[]) {
     const searchParams = new URLSearchParams(url.search);
-    for (const object of objects) {
-        for (const key in object) {
-            if (Array.isArray(object[key])) {
-                searchParams.delete(key);
-                for (const item of object[key]) {
-                    searchParams.append(key, item);
-                }
-            } else {
-                searchParams.set(key, object[key]);
-            }
-        }
-    }
+    setFlattenedQueryParams(searchParams, objects);
     url.search = searchParams.toString();
 }
 
diff --git a/samples/client/petstore/typescript-axios/builds/with-npm-version/common.ts b/samples/client/petstore/typescript-axios/builds/with-npm-version/common.ts
index 1b1d3a4b7ae..37c079770b7 100644
--- a/samples/client/petstore/typescript-axios/builds/with-npm-version/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-npm-version/common.ts
@@ -83,24 +83,34 @@ export const setOAuthToObject = async function (object: any, name: string, scope
     }
 }
 
+function setFlattenedQueryParams(urlSearchParams: URLSearchParams, parameter: any, key: string = ""): void {
+    if (typeof parameter === "object") {
+        if (Array.isArray(parameter)) {
+            (parameter as any[]).forEach(item => setFlattenedQueryParams(urlSearchParams, item, key));
+        } 
+        else {
+            Object.keys(parameter).forEach(currentKey => 
+                setFlattenedQueryParams(urlSearchParams, parameter[currentKey], `${key}.${currentKey}`)
+            );
+        }
+    } 
+    else {
+        if (urlSearchParams.has(key)) {
+            urlSearchParams.append(key, parameter);
+        } 
+        else {
+            urlSearchParams.set(key, parameter);
+        }
+    }
+}
+
 /**
  *
  * @export
  */
 export const setSearchParams = function (url: URL, ...objects: any[]) {
     const searchParams = new URLSearchParams(url.search);
-    for (const object of objects) {
-        for (const key in object) {
-            if (Array.isArray(object[key])) {
-                searchParams.delete(key);
-                for (const item of object[key]) {
-                    searchParams.append(key, item);
-                }
-            } else {
-                searchParams.set(key, object[key]);
-            }
-        }
-    }
+    setFlattenedQueryParams(searchParams, objects);
     url.search = searchParams.toString();
 }
 
diff --git a/samples/client/petstore/typescript-axios/builds/with-single-request-parameters/common.ts b/samples/client/petstore/typescript-axios/builds/with-single-request-parameters/common.ts
index 1b1d3a4b7ae..37c079770b7 100644
--- a/samples/client/petstore/typescript-axios/builds/with-single-request-parameters/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-single-request-parameters/common.ts
@@ -83,24 +83,34 @@ export const setOAuthToObject = async function (object: any, name: string, scope
     }
 }
 
+function setFlattenedQueryParams(urlSearchParams: URLSearchParams, parameter: any, key: string = ""): void {
+    if (typeof parameter === "object") {
+        if (Array.isArray(parameter)) {
+            (parameter as any[]).forEach(item => setFlattenedQueryParams(urlSearchParams, item, key));
+        } 
+        else {
+            Object.keys(parameter).forEach(currentKey => 
+                setFlattenedQueryParams(urlSearchParams, parameter[currentKey], `${key}.${currentKey}`)
+            );
+        }
+    } 
+    else {
+        if (urlSearchParams.has(key)) {
+            urlSearchParams.append(key, parameter);
+        } 
+        else {
+            urlSearchParams.set(key, parameter);
+        }
+    }
+}
+
 /**
  *
  * @export
  */
 export const setSearchParams = function (url: URL, ...objects: any[]) {
     const searchParams = new URLSearchParams(url.search);
-    for (const object of objects) {
-        for (const key in object) {
-            if (Array.isArray(object[key])) {
-                searchParams.delete(key);
-                for (const item of object[key]) {
-                    searchParams.append(key, item);
-                }
-            } else {
-                searchParams.set(key, object[key]);
-            }
-        }
-    }
+    setFlattenedQueryParams(searchParams, objects);
     url.search = searchParams.toString();
 }
 
diff --git a/samples/client/petstore/typescript-axios/builds/with-string-enums/common.ts b/samples/client/petstore/typescript-axios/builds/with-string-enums/common.ts
index 1b1d3a4b7ae..37c079770b7 100644
--- a/samples/client/petstore/typescript-axios/builds/with-string-enums/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-string-enums/common.ts
@@ -83,24 +83,34 @@ export const setOAuthToObject = async function (object: any, name: string, scope
     }
 }
 
+function setFlattenedQueryParams(urlSearchParams: URLSearchParams, parameter: any, key: string = ""): void {
+    if (typeof parameter === "object") {
+        if (Array.isArray(parameter)) {
+            (parameter as any[]).forEach(item => setFlattenedQueryParams(urlSearchParams, item, key));
+        } 
+        else {
+            Object.keys(parameter).forEach(currentKey => 
+                setFlattenedQueryParams(urlSearchParams, parameter[currentKey], `${key}.${currentKey}`)
+            );
+        }
+    } 
+    else {
+        if (urlSearchParams.has(key)) {
+            urlSearchParams.append(key, parameter);
+        } 
+        else {
+            urlSearchParams.set(key, parameter);
+        }
+    }
+}
+
 /**
  *
  * @export
  */
 export const setSearchParams = function (url: URL, ...objects: any[]) {
     const searchParams = new URLSearchParams(url.search);
-    for (const object of objects) {
-        for (const key in object) {
-            if (Array.isArray(object[key])) {
-                searchParams.delete(key);
-                for (const item of object[key]) {
-                    searchParams.append(key, item);
-                }
-            } else {
-                searchParams.set(key, object[key]);
-            }
-        }
-    }
+    setFlattenedQueryParams(searchParams, objects);
     url.search = searchParams.toString();
 }