express validation return [object object]

Question

import {check, validationResult} from 'express-validator';

export const validate = (req, res, next) => {
  const errors = validationResult(req);
  if (!errors.isEmpty()) {
    throw new Error(errors.array());
  }

  next();
};

router.post(
  '/register',
  [
    check('first_name').exists(),
    check('last_name').exists(),
    check('username').exists(),
  ],
  validate,
  (req, res) => {
    return res.json({status: 'success', message: 'Ok'});
  },
);

express validator return 500 [object Object] while console does correct print

[
  {
    value: undefined,
    msg: 'Invalid value',
    param: 'last_name',
    location: 'body'
  },
  {
    value: undefined,
    msg: 'Invalid value',
    param: 'username',
    location: 'body'
  }
]

How can we fix this please guide it should print what it is receiving into console

Answer 1

Please update your middleware with response or create error middleware

export const validate = (req, res, next) => {
  const errors = validationResult(req);
  if (!errors.isEmpty()) {
    res.json({error: errors.array()})
  }

  next();
};

Try this it should work