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 aa594015c7f9..004fc11fdae8 100755
--- a/modules/openapi-generator/src/main/resources/typescript-axios/common.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript-axios/common.mustache
@@ -118,10 +118,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export
diff --git a/samples/client/echo_api/typescript-axios/build/common.ts b/samples/client/echo_api/typescript-axios/build/common.ts
index fc1881f27b35..c4b85d352ca7 100644
--- a/samples/client/echo_api/typescript-axios/build/common.ts
+++ b/samples/client/echo_api/typescript-axios/build/common.ts
@@ -126,10 +126,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export
diff --git a/samples/client/others/typescript-axios/with-separate-models-and-api-inheritance/common.ts b/samples/client/others/typescript-axios/with-separate-models-and-api-inheritance/common.ts
index 95d62a0dcddb..71ef49eebeb4 100644
--- a/samples/client/others/typescript-axios/with-separate-models-and-api-inheritance/common.ts
+++ b/samples/client/others/typescript-axios/with-separate-models-and-api-inheritance/common.ts
@@ -126,10 +126,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export
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 d629dec4427f..259040a2b386 100644
--- a/samples/client/petstore/typescript-axios/builds/composed-schemas/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/composed-schemas/common.ts
@@ -126,10 +126,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export
diff --git a/samples/client/petstore/typescript-axios/builds/default/common.ts b/samples/client/petstore/typescript-axios/builds/default/common.ts
index d5b9e4718aea..c58729d6aaf5 100644
--- a/samples/client/petstore/typescript-axios/builds/default/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/default/common.ts
@@ -126,10 +126,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export
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 d5b9e4718aea..c58729d6aaf5 100644
--- a/samples/client/petstore/typescript-axios/builds/es6-target/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/es6-target/common.ts
@@ -126,10 +126,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export
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 c0f62a7b6df1..e1b019a31500 100644
--- a/samples/client/petstore/typescript-axios/builds/test-petstore/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/test-petstore/common.ts
@@ -126,10 +126,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export
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 d5b9e4718aea..c58729d6aaf5 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
@@ -126,10 +126,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export
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 c0f62a7b6df1..e1b019a31500 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
@@ -126,10 +126,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export
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 d5b9e4718aea..c58729d6aaf5 100644
--- a/samples/client/petstore/typescript-axios/builds/with-interfaces/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-interfaces/common.ts
@@ -126,10 +126,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export
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 a88b97565783..25f8cc331dce 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
@@ -127,10 +127,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export
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 d5b9e4718aea..c58729d6aaf5 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
@@ -126,10 +126,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export
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 d5b9e4718aea..c58729d6aaf5 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
@@ -126,10 +126,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export
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 d5b9e4718aea..c58729d6aaf5 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
@@ -126,10 +126,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export
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 d5b9e4718aea..c58729d6aaf5 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
@@ -126,10 +126,50 @@ export const serializeDataIfNeeded = function (value: any, requestOptions: any,
         ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
         : nonString;
     return needsSerialization
-        ? JSON.stringify(value !== undefined ? value : {})
+        ? JSON.stringify(value !== undefined ? convertMapsAndSetsToPlain(value) : {})
         : (value || "");
 }
 
+function convertMapsAndSetsToPlain(value: any): any {
+    if (typeof Set === "undefined") return value;
+    if (typeof Map === "undefined") return value;
+    if (typeof value !== "object" || !value) {
+        return value;
+    }
+    if (value instanceof Set) {
+        return Array.from(value).map(item => convertMapsAndSetsToPlain(item));
+    }
+    if (value instanceof Map) {
+        const entries: Array<[string, any]> = [];
+        value.forEach((value: any, key: any) => {
+            entries.push([key, convertMapsAndSetsToPlain(value)])
+        });
+        return objectFromEntries(entries);
+    }
+    if (Array.isArray(value)) {
+        return value.map(it => convertMapsAndSetsToPlain(it));
+    }
+    return objectFromEntries(objectEntries(value)
+        .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+}
+
+/**
+ * Ponyfill for Object.entries
+ */
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+/**
+ * Ponyfill for Object.fromEntries
+ */
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 /**
  *
  * @export