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 d778f29e6d3b..59627ddaa531 100755
--- a/modules/openapi-generator/src/main/resources/typescript-axios/common.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript-axios/common.mustache
@@ -90,10 +90,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
diff --git a/samples/client/echo_api/typescript-axios/build/common.ts b/samples/client/echo_api/typescript-axios/build/common.ts
index 41e36d497493..8042a77103e2 100644
--- a/samples/client/echo_api/typescript-axios/build/common.ts
+++ b/samples/client/echo_api/typescript-axios/build/common.ts
@@ -97,10 +97,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
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 e6ac882c1dac..bfee2823f17f 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
@@ -97,10 +97,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
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 ff80920e8850..96e4298fa386 100644
--- a/samples/client/petstore/typescript-axios/builds/composed-schemas/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/composed-schemas/common.ts
@@ -97,10 +97,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
diff --git a/samples/client/petstore/typescript-axios/builds/default/common.ts b/samples/client/petstore/typescript-axios/builds/default/common.ts
index 48a99b2fb1e0..6d09d5aaa1a9 100644
--- a/samples/client/petstore/typescript-axios/builds/default/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/default/common.ts
@@ -97,10 +97,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
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 48a99b2fb1e0..6d09d5aaa1a9 100644
--- a/samples/client/petstore/typescript-axios/builds/es6-target/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/es6-target/common.ts
@@ -97,10 +97,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
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 0a5b63b231ff..597d494f615a 100644
--- a/samples/client/petstore/typescript-axios/builds/test-petstore/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/test-petstore/common.ts
@@ -97,10 +97,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
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 48a99b2fb1e0..6d09d5aaa1a9 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
@@ -97,10 +97,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
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 0a5b63b231ff..597d494f615a 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
@@ -97,10 +97,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
diff --git a/samples/client/petstore/typescript-axios/builds/with-interfaces-and-with-single-request-param/common.ts b/samples/client/petstore/typescript-axios/builds/with-interfaces-and-with-single-request-param/common.ts
index 48a99b2fb1e0..6d09d5aaa1a9 100644
--- a/samples/client/petstore/typescript-axios/builds/with-interfaces-and-with-single-request-param/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-interfaces-and-with-single-request-param/common.ts
@@ -97,10 +97,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
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 48a99b2fb1e0..6d09d5aaa1a9 100644
--- a/samples/client/petstore/typescript-axios/builds/with-interfaces/common.ts
+++ b/samples/client/petstore/typescript-axios/builds/with-interfaces/common.ts
@@ -97,10 +97,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
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 69c609709819..07a0e4dc4759 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
@@ -98,10 +98,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
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 48a99b2fb1e0..6d09d5aaa1a9 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
@@ -97,10 +97,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
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 48a99b2fb1e0..6d09d5aaa1a9 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
@@ -97,10 +97,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
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 48a99b2fb1e0..6d09d5aaa1a9 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
@@ -97,10 +97,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }
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 48a99b2fb1e0..6d09d5aaa1a9 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
@@ -97,10 +97,50 @@ 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));
+    }
+    const proto = typeof Reflect !== "undefined"
+        ? Reflect.getPrototyReflect.getPrototypeOf(value)
+        : value.__proto__;
+    if (proto === Object.prototype || proto === null) {
+        return objectFromEntries(objectEntries(value)
+            .map(([k, v]) => [k, convertMapsAndSetsToPlain(v)]));
+    }
+    return value;
+}
+
+function objectEntries(object: Record<string, any>): Array<[string, any]> {
+    return Object.keys(object).map(key => [key, object[key]]);
+}
+
+function objectFromEntries(entries: any): Record<string, any> {
+    return [...entries].reduce((object, [key, val]) => {
+        object[key] = val;
+        return object;
+    }, {});
+}
+
 export const toPathString = function (url: URL) {
     return url.pathname + url.search + url.hash
 }