diff --git a/modules/openapi-generator/src/main/resources/Javascript/ApiClient.mustache b/modules/openapi-generator/src/main/resources/Javascript/ApiClient.mustache
index b6bbc4737493..c0c692fc5b0a 100644
--- a/modules/openapi-generator/src/main/resources/Javascript/ApiClient.mustache
+++ b/modules/openapi-generator/src/main/resources/Javascript/ApiClient.mustache
@@ -546,8 +546,8 @@
         if (type === Object) {
           // generic object, return directly
           return data;
-        } else if (typeof type === 'function') {
-          // for model type like: User
+        } else if (typeof type.constructFromObject === 'function') {
+          // for model type like User or enum class
           return type.constructFromObject(data);
         } else if (Array.isArray(type)) {
           // for array type like: ['String']
diff --git a/modules/openapi-generator/src/main/resources/Javascript/es6/ApiClient.mustache b/modules/openapi-generator/src/main/resources/Javascript/es6/ApiClient.mustache
index 49b92e21cae8..694013f1425c 100644
--- a/modules/openapi-generator/src/main/resources/Javascript/es6/ApiClient.mustache
+++ b/modules/openapi-generator/src/main/resources/Javascript/es6/ApiClient.mustache
@@ -502,8 +502,8 @@ class ApiClient {
                 if (type === Object) {
                     // generic object, return directly
                     return data;
-                } else if (typeof type === 'function') {
-                    // for model type like: User
+                } else if (typeof type.constructFromObject === 'function') {
+                    // for model type like User and enum class
                     return type.constructFromObject(data);
                 } else if (Array.isArray(type)) {
                     // for array type like: ['String']
diff --git a/samples/client/petstore/javascript-es6/src/ApiClient.js b/samples/client/petstore/javascript-es6/src/ApiClient.js
index 369632309dc9..50bdc6111313 100644
--- a/samples/client/petstore/javascript-es6/src/ApiClient.js
+++ b/samples/client/petstore/javascript-es6/src/ApiClient.js
@@ -486,8 +486,8 @@ class ApiClient {
                 if (type === Object) {
                     // generic object, return directly
                     return data;
-                } else if (typeof type === 'function') {
-                    // for model type like: User
+                } else if (typeof type.constructFromObject === 'function') {
+                    // for model type like User and enum class
                     return type.constructFromObject(data);
                 } else if (Array.isArray(type)) {
                     // for array type like: ['String']
diff --git a/samples/client/petstore/javascript-promise-es6/src/ApiClient.js b/samples/client/petstore/javascript-promise-es6/src/ApiClient.js
index 2b2d43810cf0..50ef10e264e9 100644
--- a/samples/client/petstore/javascript-promise-es6/src/ApiClient.js
+++ b/samples/client/petstore/javascript-promise-es6/src/ApiClient.js
@@ -478,8 +478,8 @@ class ApiClient {
                 if (type === Object) {
                     // generic object, return directly
                     return data;
-                } else if (typeof type === 'function') {
-                    // for model type like: User
+                } else if (typeof type.constructFromObject === 'function') {
+                    // for model type like User and enum class
                     return type.constructFromObject(data);
                 } else if (Array.isArray(type)) {
                     // for array type like: ['String']
diff --git a/samples/client/petstore/javascript-promise/src/ApiClient.js b/samples/client/petstore/javascript-promise/src/ApiClient.js
index 0415153dac19..883b148d5ab3 100644
--- a/samples/client/petstore/javascript-promise/src/ApiClient.js
+++ b/samples/client/petstore/javascript-promise/src/ApiClient.js
@@ -525,8 +525,8 @@
         if (type === Object) {
           // generic object, return directly
           return data;
-        } else if (typeof type === 'function') {
-          // for model type like: User
+        } else if (typeof type.constructFromObject === 'function') {
+          // for model type like User or enum class
           return type.constructFromObject(data);
         } else if (Array.isArray(type)) {
           // for array type like: ['String']
diff --git a/samples/client/petstore/javascript/src/ApiClient.js b/samples/client/petstore/javascript/src/ApiClient.js
index 07b9ab030ec4..4e33f192e4a0 100644
--- a/samples/client/petstore/javascript/src/ApiClient.js
+++ b/samples/client/petstore/javascript/src/ApiClient.js
@@ -536,8 +536,8 @@
         if (type === Object) {
           // generic object, return directly
           return data;
-        } else if (typeof type === 'function') {
-          // for model type like: User
+        } else if (typeof type.constructFromObject === 'function') {
+          // for model type like User or enum class
           return type.constructFromObject(data);
         } else if (Array.isArray(type)) {
           // for array type like: ['String']