diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/JavascriptClientCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/JavascriptClientCodegen.java
index 2620efe209d..5b6862337cd 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/JavascriptClientCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/JavascriptClientCodegen.java
@@ -134,8 +134,8 @@ public class JavascriptClientCodegen extends DefaultCodegen implements CodegenCo
         typeMapping.put("double", "Number");
         typeMapping.put("number", "Number");
         typeMapping.put("DateTime", "Date");
-        // binary not supported in JavaScript client right now, using Object as a workaround
-        typeMapping.put("binary", "Object");
+        // binary not supported in JavaScript client right now, using String as a workaround
+        typeMapping.put("binary", "String");
 
         importMapping.clear();
     }
diff --git a/samples/client/petstore/javascript/src/api/PetApi.js b/samples/client/petstore/javascript/src/api/PetApi.js
index 281fa1e214c..1746e343abb 100644
--- a/samples/client/petstore/javascript/src/api/PetApi.js
+++ b/samples/client/petstore/javascript/src/api/PetApi.js
@@ -377,7 +377,7 @@
      * Returns a pet when ID < 10.  ID > 10 or nonintegers will simulate API error conditions
      * @param {Integer}  petId ID of pet that needs to be fetched
      * @param {function} callback the callback function, accepting three arguments: error, data, response
-     *   data is of type: Object
+     *   data is of type: String
      */
     self.getPetByIdWithByteArray = function(petId, callback) {
       var postBody = null;
@@ -420,7 +420,7 @@
     /**
      * Fake endpoint to test byte array in body parameter for adding a new pet to the store
      * 
-     * @param {Object}  body Pet object in the form of byte array
+     * @param {String}  body Pet object in the form of byte array
      * @param {function} callback the callback function, accepting three arguments: error, data, response
      */
     self.addPetUsingByteArray = function(body, callback) {