{"componentChunkName":"component---src-pages-markdown-remark-fields-slug-js","path":"/engineering/oauth-implemenation-using-node/","result":{"data":{"markdownRemark":{"id":"f2ea29c9-53de-575c-a263-3909142ca770","excerpt":"In this blog, we’ll be implementing OAuth by Github in a Node.js Application Before You Get Started This tutorial assumes you have: Basic knowledge of HTML/CSS…","html":"

In this blog, we’ll be implementing OAuth by Github in a Node.js Application

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Before You Get Started

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This tutorial assumes you have:

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Step 1: Register a Github OAuth App

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To implement Github Auth we need to register a new application in Github OAuth Apps.

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Once you start the process you will get a form like this.

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Step 2: Initialize a node.js project with all the dependencies

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First in an empty folder run the below command

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npm init
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It essentially just creates the package.json file with all the basic information you will provide. after that, we will install all the dependencies needed in our project

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npm install express ejs axios --save
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Step 3: Writing express server code to accept web requests

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Create a file index.js in the root folder of your app and add the following code:

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// index.js\n\n/*  EXPRESS */\nconst express = require('express');\nconst app = express();\n\napp.set('view engine', 'ejs');\nvar access_token = "";\n\napp.get('/', function(req, res) {\n  res.render('pages/index',{client_id: clientID});\n});\n\nconst port = process.env.PORT || 2400;\napp.listen(port , () => console.log('App listening on port ' + port));
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Our web server has been set up, now we will add the code related to sending the OAuth request to GitHub using Axios package, at the bottom of the index.js file:

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// index.js\n\n// Import the axios library, to make HTTP requests\nconst axios = require('axios')\n// This is the client ID and client secret that you obtained\n// while registering on github app\nconst clientID = 'xxxxxxxxxxxx'\nconst clientSecret = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxx'\n\n// Declare the callback route\napp.get('/github/callback', (req, res) => {\n\n  // The req.query object has the query params that were sent to this route.\n  const requestToken = req.query.code\n  \n  axios({\n    method: 'post',\n    url: `https://github.com/login/oauth/access_token?client_id=${clientID}&client_secret=${clientSecret}&code=${requestToken}`,\n    // Set the content type header, so that we get the response in JSON\n    headers: {\n         accept: 'application/json'\n    }\n  }).then((response) => {\n    access_token = response.data.access_token\n    res.redirect('/success');\n  })\n})\n\napp.get('/success', function(req, res) {\n\n  axios({\n    method: 'get',\n    url: `https://api.github.com/user`,\n    headers: {\n      Authorization: 'token ' + access_token\n    }\n  }).then((response) => {\n    res.render('pages/success',{ userData: response.data });\n  })\n});
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Note: The callback URL should be the same as used in the GitHub app configuration.

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Step 4: Creating a Login and Profile page

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Create an ejs file under path views/pages/index.js, it will render into a nice looking Github authorization page:

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<!-- views/index.ejs -->\n<!doctype html>\n<html>\n<head>\n    <title>Github OAuth</title>\n    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"> <!-- load bulma css -->\n    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css"> <!-- load fontawesome -->\n    <style>\n        body        { padding-top:70px; }\n    </style>\n</head>\n<body>\n<div class="container">\n    <div class="jumbotron text-center text-primary">\n        <h1><span class="fa fa-github"></span> Github OAuth</h1>\n        <p>Authorize your app with:</p>\n        <a href="https://github.com/login/oauth/authorize?client_id=<%= client_id %>" class="btn btn-danger"><span class="fa fa-github"></span> Github Login</a>\n    </div>\n</div>\n</body>\n</html>
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After it we will create an ejs file under path views/pages/success.js, it will be used to show the user's GitHub information we will get after authorized by Github

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<!-- views/success.ejs -->\n<!doctype html>\n<html>\n  <head>\n    <title>Github OAuth</title>\n    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"> <!-- load bulma css -->\n    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css"> <!-- load fontawesome -->\n      <style>\n          body        { padding-top:70px; }\n      </style>\n  </head>\n  <body>\n    <div class="container">\n      <div class="jumbotron">\n          <h1 class="text-primary  text-center"><span class="fa fa-github"></span> Github Information</h1>\n          <div class="row">\n            <div class="col-sm-6">\n              <div class="well">\n                <p>\n                  <strong>Name</strong>: <%= userData.name %><br>\n                  <strong>Username</strong>: <%= userData.login %><br>\n                    <strong>Company</strong>: <%= userData.company %><br>\n                    <strong>Bio</strong>: <%= userData.bio %>\n                </p>\n              </div>\n            </div>\n        </div>\n      </div>\n    </div>\n  </body>\n</html>
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Note: Here we are also using bootstrap and font-awesome css to make our web pages look good.

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We have finished building our OAuth authorization page, let's run the application by below command

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node index.js
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Once our server is running, we can see our social login page on http://localhost:2400/

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We need to click on the Github Login button, which will redirect us to google login page.

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You can implement the OAuth in Node.js by the above process, You can found the complete code used in this tutorial on out

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Github Repo

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