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This blog article will guide you to add \"log in with LinkedIn\"\nfunctionality in your application. Here we will be implementing Linkedin Login using NodeJS and Passport.

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Passport is an authentication middleware for Node, which authenticates requests and delegates all other functionality to the application. Considering the unique application requirements, Passport has stuck to authentication mechanisms known as strategies. In the blog, we will be implementing a similar strategy for Login with Linkedin.

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Pre -Requisites:

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  1. Basic Knowledge of NodeJS
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  2. Node JS should be installed on your system.
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Steps to configure

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  1. Creating Linkedin APP_ID and APP_SECRET
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  2. Go to Developer Linkedin and login with your Linkedin account.
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  3. Once you have registered, click on the create app link and add the required details to create an app
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Provide basic details about your app:

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  cd Linkedin-node-authentication
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  1. In the root create a file package.json and copy the following code
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The dependencies, we are going to use in the projects are

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{\n  "name": "linkedin-login-node",\n  "version": "1.0.0",\n  "description": "Basic application for setting up Linkedin login using node and passport",\n  "main": "index.js",\n  "scripts": {\n    "test": "echo \\"Error: no test specified\\" && exit 1",\n    "start": "node server.js"\n  },\n  "author": "LoginRadius",\n  "license": "ISC",\n  "dependencies": {\n    "ejs": "^3.1.2",\n    "express": "^4.17.1",\n    "express-session": "^1.17.1",\n    "passport": "^0.4.1",\n    "passport-linkedin-oauth2": "^2.0.0"\n  }\n}
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    After this run the following command in the terminal

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    npm install
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  2. Now create a file named server.js and paste the following code
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const express = require('express');\nconst app = express();\nconst session = require('express-session');\nconst passport = require('passport');\nconst LinkedInStrategy = require('passport-linkedin-oauth2').Strategy;\nconst routes = require('./routes.js');\nconst config = require('./config')\n\napp.set('view engine', 'ejs');\n\napp.use(session({\n  resave: false,\n  saveUninitialized: true,\n  secret: 'SECRET'\n}));\n\napp.use(passport.initialize());\napp.use(passport.session());\n\npassport.serializeUser(function (user, cb) {\n  cb(null, user);\n});\n\npassport.deserializeUser(function (obj, cb) {\n  cb(null, obj);\n});\n\npassport.use(new LinkedInStrategy({\n  clientID: config.linkedinAuth.clientID,\n  clientSecret: config.linkedinAuth.clientSecret,\n  callbackURL: config.linkedinAuth.callbackURL,\n  scope: ['r_emailaddress', 'r_liteprofile'],\n}, function (token, tokenSecret, profile, done) {\n  return done(null, profile);\n}\n));\n\napp.use('/', routes);\n\nconst port = 3000;\n\napp.listen(port, () => {\n  console.log('App listening on port ' + port);\n});
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  1. Now create a file named routes.js in the root directory and paste the following code
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const passport = require('passport');\nconst express = require('express');\nvar router = express.Router();\n\nrouter.get('/', function (req, res) {\n  res.render('pages/index.ejs'); // load the index.ejs file\n});\n\nrouter.get('/profile', isLoggedIn, function (req, res) {\n  res.render('pages/profile.ejs', {\n    user: req.user // get the user out of session and pass to template\n  });\n});\n\nrouter.get('/auth/linkedin', passport.authenticate('linkedin', {\n  scope: ['r_emailaddress', 'r_liteprofile'],\n}));\n\nrouter.get('/auth/linkedin/callback',\n  passport.authenticate('linkedin', {\n    successRedirect: '/profile',\n    failureRedirect: '/login'\n  }));\n\nrouter.get('/logout', function (req, res) {\n  req.logout();\n  res.redirect('/');\n});\n\n\nfunction isLoggedIn(req, res, next) {\n  if (req.isAuthenticated())\n    return next();\n  res.redirect('/');\n}\n\nmodule.exports = router;
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  1. Create a directory views and under this create a directory named pages. Under this folder create two pages named profile.ejs and index.ejs
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// index.ejs\n<!doctype html>\n<html>\n\n<head>\n  <title>Linkedin Node Authentication</title>\n  <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">\n  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">\n  <link rel="stylesheet" type="text/css"\n    href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.5/css/materialize.min.css">\n  <style>\n    .linkedin {\n      background-color: #0073b1 !important;\n      color: #fff !important;\n    }\n    .fa-linkedin-f:before,\n    .fa-linkedin:before {\n      content: "\\f0e1";\n    }\n  </style>\n</head>\n\n<body>\n  <nav class="light-blue lighten-1" role="navigation">\n    <div class="nav-wrapper container">\n      <a id="logo-container" href="#" class="brand-logo">Node Authentication</a>\n    </div>\n  </nav>\n  <div class="section no-pad-bot" id="index-banner">\n    <div class="container">\n      <br><br>\n      <div class="row center">\n        <div class="col s6 offset-s3">\n          <div class="card">\n            <div class="card-content">\n              <span class="card-title">Linkedin Login using Node and passport</span>\n            </div>\n            <div class="card-action">\n              <a href="/auth/linkedin" class="waves-effect waves-light btn social linkedin">\n                <i class="fa fa-linkedin"></i> Sign in with Linkedin\n              </a>\n            </div>\n          </div>\n        </div>\n      </div>\n    </div>\n  </div>\n</body>\n\n</html>
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<!- profile.ejs->\n<!doctype html>\n<html>\n\n<head>  \n  <title>LinkedIn Node Authentication</title>\n  <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">\n  <link rel="stylesheet" type="text/css"\n    href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.5/css/materialize.min.css">\n  <style>\n    .card:hover {\n      box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19), 0 6px 6px rgba(0, 0, 0, 0.23);\n      margin-bottom: 54px;\n    }\n  </style>\n</head>\n\n<body>\n  <nav class="light-blue lighten-1" role="navigation">\n    <div class="nav-wrapper container">\n      <a id="logo-container" href="#" class="brand-logo">Node Authentication</a>\n      <a href="/logout" class="right">Logout</a>\n    </div>\n  </nav>\n  <div class="section no-pad-bot" id="index-banner">\n    <div class="container">\n      <br><br>\n      <div class="row center">\n        <div class="col s12">\n          <div class="card">\n            <div class="card-content blue lighten-3">\n              <span class="card-title white-text"><strong><i class="large material-icons">person</i>\n                </strong></span>\n            </div>\n            <div class="card-action">\n              <h5><b><%= user.displayName %></b></h5>\n              <p><strong>Linkedin id</strong>: <%= user.id %></p>\n            </div>\n          </div>\n        </div>\n      </div>\n    </div>\n  </div>\n</body>\n\n</html>
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  1. Finally, when you are done with the above code you can now write all your app details gathered in step 1 to config.js file created in the root directory
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module.exports = {\n  'linkedinAuth': {\n    'clientID': '<CLIENT_ID>', // your App ID\n    'clientSecret': '<CLIENT_SECRET>', // your App Secret\n    'callbackURL': 'http://127.0.0.1:3000/auth/linkedin/callback'\n  }\n}
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  1. Let's have a final check with the repository, aftre follwoing all the steps in the same pordr the directory structure of your code will look like below:
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// Final directory structure\nLinkedin-node-authentication/\n  --|node_modules\n  --|views/\n    |--|pages/\n    |----|error.ejs\n    |----|profile.ejs\n    |----|index.ejs\n  --|config.js\n  --|package.json\n  --|package-lock.json\n  --|routes.js\n  --|server.js
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  1. Now run the server by executing below command in the directory Linkedin-node-authentication/
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npm start
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  1. Visit the browser with the URL http://localhost:3000
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Click on the sign in button, and you will be asked to login through Linkedin. Once logged in you will be redirected to profile page as below:

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