Express Validator Error: expressValidator is not a function

Question

I\'m trying to install and use express-validator package. I\'ve installed the package version (6.0.0) and then in my server.js file the code is:

const bodyPa         


        

Answer 1

app.use(expressValidator());

Replace this line with

app.use(expressValidator);

Answer 2

Go to package.json change "express-validator": "^6.6.0" to "express-validator": "^5.3.0", manually then run npm i

Answer 3

//just pass the checking as middleware not in the callback
//see here I've just passed an array for checking as middleware
// as the middleware is an array therefore you can add multiple checks in the array
router.post("/", [check('email', "your custom error message").isEmail()], (req, res) => {

  const errors = validationResult(req);
  if (!errors.isEmpty()) {
   res.render('errorPage', { errors: errors.array() });
   //if api caller return res.status(422).json({ errors: errors.array() });
  }
  else{
    //here everything is ok to proceed
   res.render('successPage', { data });
   //to api caller  res.json({msg : "ok"})
  }

})

Answer 4

Express Validator has been updated now you can can't use it this way This is the new way to use express validator

Alternatively you can stay with previous version by running this commands

npm uninstall express-validator
npm install express-validator@5.3.0

Answer 5

const { check, validationResult } = require('express-validator');
router.post('/finished', function (req, res) {
let email = req.body.email

check('email', 'Email required').isEmail()

var errors = validationResult(req)
if (errors) {
  req.session.errors = errors
  req.session.success = false
  res.redirect('/email-adress')
  } else {
  req.session.success = true
  res.redirect('/finished')
  }
})

Do this. And remove

app.use(expressValidator()) 

line.

Answer 6

Yeah! Even i had the same problem it took 6 hrs to find out the resolution i.e,You can change the version by writing the command in root folder (

• Command

npm install express-validator@5.3.1 --save-exact