postman "Error: ValidationError: username: Path `username` is required."

Question

I am trying to test my routes using the postman. The below is my user.model.js file

const mongoose = require('mongoose');

const Schema = mongoose.Schema;

const userSchema = new Schema({
  username: {
    type: String,
    required: true,
    unique: true,
    trim: true,
    minlength: 3
  },
}, {
  timestamps: true,
});

const User = mongoose.model('User', userSchema);

module.exports = User;

My router file for the user is below

const router = require('express').Router();
let User = require('../models/user.model');

router.route('/').get((req, res) => {
    User.find()
        .then(users => res.json(users))
        .catch(error => res.status(400).json('Error: ' + error));
});

router.route('/add').post((req, res) => {
    const username = req.body.username;

    const newUser = new User({ username });

    newUser.save()
        .then(() => res.json('User added!'))
        .catch(error => res.status(400).json('Error: ' + error));
});

module.exports = router;

each time when I am trying to test the post route for user I am getting "Error: ValidationError: username: Path username is required." error below is the screenshot of my postman

Could anyone please help me in figuring out where I am wrong.

Answer 1

The data you passed should be in JSON format and not in multi-part format. Change your Postman request as following and check.

Answer 2

I had the same problem. I could solve the problem by adding the next parts in my program:

const bodyParser = require("body-parser");

app.use(bodyParser.urlencoded({ extended: false })); 
app.use(bodyParser.json());

My bodyparser version was "^1.15.2"

Answer 3

Change your /add router:

const newUser = new User({ username : username }); // change

You have to pass your username this way.Hope this will help you.if you have any error though then let me know.