How to add Typescript definitions to Express req & res

Question

I have a set of controller functions for my REST API and I\'m getting lots of the following

error TS7006: Parameter \'req\' implicitly has an \'any\' type.
         


        

Answer 1

The best way to do this is like so.

// create some shared types in your project

import { Request, Response, NextFunction } from 'express';
export type MiddlewareFn = (req: Request, res: Response, next: NextFunction) => void;

// then use the above types:

import {MiddlewareFn} from './my-types.d.ts'

router.get('/foo', function (req, res, next) {

   // ....
});