validate a password with express-validator

Question

I'm using express-validator for express 3.x -- when the user changes their password or signs up for an new account, they have to enter their password twice.

How would I write a custom validator that will push an error to the error stack in express-validator if the two passwords (two strings) do not match?

Something like this:

req.assert('password1', 'Passwords do not match').isIdentical(password1, password2);
var mappedErrors = req.validationErrors(true);

Answer 1

I found the answer

req.assert('password2', 'Passwords do not match').equals(req.body.password1);
var mappedErrors = req.validationErrors(true);

Answer 2

Proper way : express-validator doc:checking if password confirmation matches password

const RegistrationRules = [
  check("password")
    .notEmpty().withMessage("Password should not be empty"),
  check("confirmPassword")
    .notEmpty().withMessage("Confirm Password should not be empty")
    .custom((value,{req}) =>{
        if(value !== req.body.password){
            throw new Error('Password confirmation does not match with 
            password')
        }
        return true;
    }),]