Node JS LinkedIn Login using Passport Example

Linkedin login authentication in node js 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

Sign In with Linkedin Oauth2 In Node JS

Follow the following steps and create login system in node js using express js 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: Run Development 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 npm install express ejs express-session passport passport-linkedin-oauth --save 
express-flash

Flash is an extension of connect-flash with the ability to define a flash message and render it without redirecting the request.
In this node js mysql crud tutorial express flash is used to display a warning, error and information message

express-session

Express-session is used to made a session as like in PHP. In this node js mysql crud tutorial, session is needed as the express requirement of express-flash.

EJS

To render HTML pages for login and profile

passport

Social Authentication package for Node.js

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' }
}

Step 5: Run Development 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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