ERROR:- TS2769: No overload matches this call.

[naitikprajapati1]

I'm trying to use an error-handling middleware with Express and TypeScript, but I'm getting a TypeScript error:

I'm trying to use an error-handling middleware with Express and TypeScript, but I'm getting a TypeScript error:

```typescript
const errorHandler = (err: any, req: Request, res: Response, next: NextFunction) => {
    res.status(500).json({ error: 'Something went wrong!' });
};

app.use(errorHandler); // Error occurs here

And the Error Message is:-
src/app.ts:30:9 - error TS2769: No overload matches this call.
  The last overload gave the following error.
    Argument of type '(err: any, req: Request<ParamsDictionary, any, any, ParsedQs, Record<string, any>>, res: Response<any, Record<string, any>>, next: NextFunction) => Response<...>' is not assignable to parameter of type 'PathParams'.

30 app.use(errorHandler);
           ~~~~~~~~~~~~

  node_modules/@types/express-serve-static-core/index.d.ts:157:5
    157     <
            ~
    158         P = ParamsDictionary,
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ...
    166         ...handlers: Array<RequestHandlerParams<P, ResBody, ReqBody, ReqQuery, LocalsObj>>
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    167     ): T;
        ~~~~~~~~~
    The last overload is declared here.

[bjohansebas]

Please provide us with the versions of the types you're using, the version of Express you're using, and an example of the code you're using that could serve as a reference

[krzysdz]

The error suggests that your error handler returns Response, but the errorHandler above has no return and its return type is void.

I'm assuming that you are using types for Express 5, which require return type of void | Promise<void> for [error] request handlers, the code that you really use is different from your example above and it returns Response (e.g. return res.json({ /* ... */ }). If that is the case, this comment explains the behaviour: #5987 (comment)

[naitikprajapati1]

The error suggests that your error handler returns Response, but the errorHandler above has no return and its return type is void.

I'm assuming that you are using types for Express 5, which require return type of void | Promise<void> for [error] request handlers, the code that you really use is different from your example above and it returns Response (e.g. return res.json({ /* ... */ }). If that is the case, this comment explains the behaviour: #5987 (comment)

It solved Now Thanks 👍