diff --git a/lib/index.js b/lib/index.js
index 977b3d1..575875b 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -79,7 +79,9 @@ function noQsMethod (options) {
 
         // success handler
         const onSuccess = () => {
-          socket[options.decodedPropertyName] = decoded;
+          socket[options.decodedPropertyName] = options.customDecoded
+            ? options.customDecoded(decoded)
+            : decoded;
           socket.emit('authenticated');
           if (server.$emit) {
             server.$emit('authenticated', socket);
@@ -203,7 +205,9 @@ function authorize (options) {
         return auth.fail(error, socket, accept);
       }
 
-      socket[options.decodedPropertyName] = decoded;
+      socket[options.decodedPropertyName] = options.customDecoded
+        ? options.customDecoded(decoded)
+        : decoded;
 
       return auth.success(socket, accept);
     };
diff --git a/types/index.d.ts b/types/index.d.ts
index 4ba5ba0..b216a80 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -28,6 +28,7 @@ declare module 'socketio-jwt' {
 
   interface IOptions {
     additional_auth?: (decoded: object, onSuccess: () => void, onError: (err: (string | ISocketIOError), code: string) => void) => void;
+    customDecoded?: (decoded: object) => object;
 
     callback?: (false | number);
     secret: (string | ((request: any, decodedToken: object, callback: ISocketCallback) => void));