express_validator_username_password_post_request_validation.ts

1import express, { Request, Response } from 'express';
2import { body, validationResult } from 'express-validator';
3
4const app = express();
5app.use(express.json());
6
7app.post(
8  '/user',
9  // username must be an email
10  body('username').isEmail(),
11  // password must be at least 5 chars long
12  body('password').isLength({ min: 5 }),
13  (req: Request, res: Response) => {
14    // Finds the validation errors in this request and wraps them in an object with handy functions
15    const errors = validationResult(req);
16    if (!errors.isEmpty()) {
17      return res.status(400).json({ errors: errors.array() });
18    }
19
20    res.send({
21      message: 'User created successfully',
22    });
23  },
24);
25
26app.listen(3000, () => {
27  console.log('Server started on port 3000');
28});