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A simple authentication flow for Google OAuth2
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This project was born out of frustration. I was under the assumption that you can plug in Passport.js, implement a strategy and things will work magically. Though there is some truth in the above statement, that's not the case when you have decoupled the client and the server i.e, if the client and server are hosted independently. Passport.js seemlessly plugs in with templating engines, but if you're running your client on, say Next.js and use Vercel for hosting, it's not possible for you to integrate the two.
This is where the Node Google OAuth2 package comes into picture. You can easily plug this module inside your Express code and easily implement with Google's OAuth2.

Refer to this article on Medium.

This is an example of how to list things you need to use the software and how to install them.

npm install node-google-oauth2

First, create a new instance of the GoogleAuth2 class. Before initializing, you must first set up OAuth in your GCP account.
Click here for instructions.
Make sure to note down the clientId, clientSecret, redirectURL , as they're required parameters to initialize a connection with Google's OAuth servers.

const GoogleOAuth2 = require("node-google-oauth2");
const Auth = new GoogleOAuth2({
  clientId: process.env.clientID, // e.g. asdfghjkljhgfdsghjk.apps.googleusercontent.com
  clientSecret: process.env.clientSecret, // e.g. _ASDFA%DFASDFASDFASD#FAD-
  redirect: process.env.redirect, // this must match your google api settings
});

Then, generate a Auth URL from Google on request. Return this link to the client and redirect the client to that url

Router.get("/request", async (req, res) => {
  res.redirect(await Auth.urlGoogle()); // this method returns a link
});

After successful authentication, a code will be sent through a URL query to your redirect URL.

Router.get("/redirectUrl", async (req, res) => {
  console.log(req.query.code);
  const payload = await Auth.getGoogleAccountFromCode(req.query.code);
  // create a user / approve the user
  user = payload;
  console.log(payload);
  //redirect after authentication
  res.redirect("/approve");
});

Google OAuth has never been easier😀

Contributions are what make the open source community such an amazing place to be learn, inspire, and create. Any contributions you make are greatly appreciated.

1. Fork the Project
2. Create your Feature Branch (git checkout -b feature/AmazingFeature)
3. Commit your Changes (git commit -m 'Add some AmazingFeature')
4. Push to the Branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

Distributed under the MIT License. See LICENSE for more information.

Adarsh C - @cadarsh_335 - [email protected]

Project Link: https://github.com/cadarsh/node-google-oauth2

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