User login by JWT (NodeJS)

Objective: In this article, you will know jsonwebtoken, mongoose model, how to create user using node, router.

Pre-requisite Prior to completing this article, you should have already installed all pre-requisite tooling including: Visual Studio Code, Node Package Manager (NPM), Node, Postman, Mongo Compass.

Create a Model (ProfileModel.js)

const mongoose = require('mongoose')

const DataSchema = mongoose.Schema({
    FirstName : {type: String},
    LastName : {type: String},
    EmailAddress : {type: String},
    MobileNumber : {type: String},
    City : {type: String},
    UserName : {type: String},
    Password : {type: String}
});

const ProfileModel = mongoose.model('Profile', DataSchema)
module.exports = ProfileModel;

Create a Controller (ProfileController.js)

At first import ProfileModel. Declare a variable reqBody to store body data. Then create user using ProfileModel model

Install jsonwebtoken using this command npm i jsonwebtoken. Then declare into ProfileController.js file

const ProfileModel = require("../models/ProfileModel");
var jwt = require('jsonwebtoken');

exports.CreateProfile = (req, res) => {

    let reqBody = req.body;
    ProfileModel.create(reqBody, (err, data) => {
        if(err){
            res.status(400).json({status: "Failed to user create", data: err})
        }else{
            res.status(200).json({status: "Successfully user created", data: data})
        }
    })
}

exports.UserLogin = (req, res) => {

    let UserName = req.body['UserName'];
    let Password = req.body['Password'];
    // res.status(200).json({status: "Success", data: Password})

    ProfileModel.find({UserName, Password}, (err, data) => {
       if(err){
        res.status(400).json({status: "Failed to login", data: err})
       }else{
        if(data.length > 0){
            // create auth token

            let Payload = {
                exp: Math.floor(Date.now() / 1000) + (24 * 60 * 60),
                data: data[0]
            }
            var token = jwt.sign(Payload, 'SecretKey123456789');
            res.status(200).json({status: "Successfully Login", token: token, data: data})

        }else{
            res.status(401).json({status: "Unauthorized"})
        }
       }
    })
}

The find() function is used to find particular data from the MongoDB database

Extra two thing added from normal login. Like Payload and SecretKey. Also pass the token into response token: token

            let Payload = {
                exp: Math.floor(Date.now() / 1000) + (24 * 60 * 60),
                data: data[0]
            }
            var token = jwt.sign(Payload, 'SecretKey123456789');

Default configuration (app.js)

// Basic import
const express = require('express');
const router = require('./src/routes/api')
const app = new express();
const bodyParser = require('body-parser')

// Database lib import
const mongoose = require('mongoose')

// Body parser implement
app.use(bodyParser.json())

// MongoDB database connection
let uri = 'mongodb://127.0.0.1:27017/PracticeDB'
let options = {user: '', pass: ''}
mongoose.connect(uri, options, (err) => {
    if(err){
        console.log(err)
    }else{
        console.log('Database Connection Success')
    }
})

// Routing Implement
app.use('/api/v1', router)

// Undefined Route Implement
app.use("*", (req, res) => {
    res.status(404).json({status: "Failed", data: "Not Found"})
})

module.exports = app;

Routes configuration (api.js)

const express = require('express');
const ProfileController = require('../controller/ProfileController')
const router = express.Router();

router.post('/CreateProfile', ProfileController.CreateProfile)
router.post('/UserLogin', ProfileController.UserLogin)

module.exports = router;

Index file (index.js)

const app = require('./app')

app.listen(5000, function(){
    console.log('Server run at @5000 port')
})

Now open the Postman and configure few thing like

Then login a user giving basic information and click Send Button

If giving wrong information then showing Unauthorized

Thanks for reading. Happy journey.

Reference

User create using NodeJS
Login without JWT
jsonwebtoken
Mongoose find() Function