Node JS LinkedIn Login using Passport Tutorial

Linkedin login authentication in node js express with passport. In this tutorial, you will learn how to implement a linkedin login authentication system in node js using passport js.

As well as learn how to handle Session, passport, ejs in node express js. And this linkedin login node.js passport tutorial will help you step by step to creating a linkedin auth login system in node express js framework with passport js.

Before you get started linkdin login node.js passport, you should have basic Knowledge of the followings:

• Basic knowledge of HTML/CSS
• A good understanding of JavaScript and Node.js
• Latest Node.js version installed on your system

LinkedIn Login using Node JS Express and passport

Follow the following steps and create login system in node js express framework with MySQL db:

• Step 1: Install Node Express JS Setup
• Step 2: Include Packages and routes in app.js
• Step 3: Create views
• Step 4: Create Config.js
• Step 5: Start Node Js Linkedin Login App Server

Step 1: Install Node Express JS Setup

In this step, execute the following command on terminal to create directory:

mkdir LinkedinAuth

After open LinkedinAuth directory with any text editor. And use the following command to enter your LinkedinAuth app directories, So open your cmd and run the following command:

cd LinkedinAuth

Now, execute the following command on terminal to install express, ejs, express-session and passport:

npm init -y

npm install express ejs express-session passport passport-linkedin-oauth --save

Step 2: Include Packages and routes in app.js

In this step, you need to create a file app.js in the root folder of your app and add the following code:

const express = require('express');
const app = express();
const session = require('express-session');
const passport = require('passport');
const LinkedInStrategy = require('passport-linkedin-oauth2').Strategy;
const routes = require('./routes.js');
const config = require('./config')

app.set('view engine', 'ejs');

app.use(session({
  resave: false,
  saveUninitialized: true,
  secret: 'SECRET'
}));

app.use(passport.initialize());
app.use(passport.session());

passport.serializeUser(function (user, cb) {
  cb(null, user);
});

passport.deserializeUser(function (obj, cb) {
  cb(null, obj);
});

passport.use(new LinkedInStrategy({
  clientID: config.linkedinAuth.clientID,
  clientSecret: config.linkedinAuth.clientSecret,
  callbackURL: config.linkedinAuth.callbackURL,
  scope: ['r_emailaddress', 'r_liteprofile'],
}, function (token, tokenSecret, profile, done) {
  return done(null, profile);
}
));

app.use('/', routes);

const port = 3000;

app.listen(port, () => {
  console.log('App listening on port ' + port);
});

Now create a file named route.js in the root directory and paste the following code

const passport = require('passport');
const express = require('express');
var router = express.Router();

router.get('/', function (req, res) {
  res.render('pages/index.ejs'); // load the index.ejs file
});

router.get('/profile', isLoggedIn, function (req, res) {
  res.render('pages/profile.ejs', {
    user: req.user // get the user out of session and pass to template
  });
});

router.get('/auth/linkedin', passport.authenticate('linkedin', {
  scope: ['r_emailaddress', 'r_liteprofile'],
}));

router.get('/auth/linkedin/callback',
  passport.authenticate('linkedin', {
    successRedirect: '/profile',
    failureRedirect: '/login'
  }));

router.get('/logout', function (req, res) {
  req.logout();
  res.redirect('/');
});


function isLoggedIn(req, res, next) {
  if (req.isAuthenticated())
    return next();
  res.redirect('/');
}

module.exports = router;

Step 3: Create views

In this step, you need to create directory name pages. So, visit the views directory in your app and create the pages directory.

Inside the pages/ direcotry, you need to create two views file. The views file is the following:

• index.ejs
• profile.ejs

Application-folder/viwes/pages/index.js

Now, open your index.ejs file and update the following code into your file:

<!doctype html>
<html>

<head>
  <title>Linkedin Node Authentication</title>
  <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
  <link rel="stylesheet" type="text/css"
    href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.5/css/materialize.min.css">
  <style>
    .linkedin {
      background-color: #0073b1 !important;
      color: #fff !important;
    }
    .fa-linkedin-f:before,
    .fa-linkedin:before {
      content: "\f0e1";
    }
  </style>
</head>

<body>
  <nav class="light-blue lighten-1" role="navigation">
    <div class="nav-wrapper container">
      <a id="logo-container" href="#" class="brand-logo">Node Authentication</a>
    </div>
  </nav>
  <div class="section no-pad-bot" id="index-banner">
    <div class="container">
      <br><br>
      <div class="row center">
        <div class="col s6 offset-s3">
          <div class="card">
            <div class="card-content">
              <span class="card-title">Linkedin Login using Node and passport</span>
            </div>
            <div class="card-action">
              <a href="/auth/linkedin" class="waves-effect waves-light btn social linkedin">
                <i class="fa fa-linkedin"></i> Sign in with Linkedin
              </a>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</body>

</html>

This index.ejs file contains login form.

Application-folder/viwes/pages/profile.js

Next, open your profile.ejs file and update the following code into your file:

<!doctype html>
<html>

<head>  
  <title>LinkedIn Node Authentication</title>
  <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
  <link rel="stylesheet" type="text/css"
    href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.5/css/materialize.min.css">
  <style>
    .card:hover {
      box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19), 0 6px 6px rgba(0, 0, 0, 0.23);
      margin-bottom: 54px;
    }
  </style>
</head>

<body>
  <nav class="light-blue lighten-1" role="navigation">
    <div class="nav-wrapper container">
      <a id="logo-container" href="#" class="brand-logo">Node Authentication</a>
      <a href="/logout" class="right">Logout</a>
    </div>
  </nav>
  <div class="section no-pad-bot" id="index-banner">
    <div class="container">
      <br><br>
      <div class="row center">
        <div class="col s12">
          <div class="card">
            <div class="card-content blue lighten-3">
              <span class="card-title white-text"><strong><i class="large material-icons">person</i>
                </strong></span>
            </div>
            <div class="card-action">
              <h5><b><%= user.displayName %></b></h5>
              <p><strong>Linkedin id</strong>: <%= user.id %></p>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</body>

</html>

Step 4: Create Config.js

In this step, you need to config.js file in the root directory. Then add the following code into it:

module.exports = {
  'linkedinAuth': {
    'clientID': '<CLIENT_ID>', // your App ID
    'clientSecret': '<CLIENT_SECRET>', // your App Secret
    'callbackURL': 'http://127.0.0.1:3000/auth/linkedin/callback'
  }
}

If you do not know how to get client id and secret of Linkedin app from Linkedin Developer Console, then you can create Linkedin App in Linkedin Developer Console by following the steps given below.

Step 1:- create linkedin app by click the following url :- https://www.linkedin.com/developers/apps/new . And create linkedin app.

When you click the above given url the following below page will be displayed. So fill the details and create your linkedin app:

Step 2:- After successfully create the app set the redirect URL for example :

Step 3:- Finally, you redirect to dashboard by linkedin.com. So you can copy client id and secret from linkedin app dashboard like following picture:

Now linkedin app has been created successfully.

Step 5: Start Node Js Linkedin Login App Server

You can use the following command to run development server:

//run the below command

npm start

after run this command open your browser and hit 

http://127.0.0.1:3000
OR
http://localhost:3000

Conclusion

In this node express js LinkedIn auth login example tutorial. You have learned how to create LinkedIn authentication in node js express with passport.

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