How do I set up OAuth in a Node.js Express application?

How do I set up OAuth in a Node.js Express application?

To set up OAuth in a Node.js Express application, you'll need to use a library like Passport.js. First, install it using npm.

What are the steps to install Passport.js?

You can install Passport.js by running npm install passport passport-oauth2 in your terminal.

How do I configure Passport.js for Google OAuth?

You'll need to create a Google Developer account, set up a project, and obtain your client ID and secret. Then, configure Passport with these credentials.

Can you show me a code example for the configuration?

Sure! Here's a basic example:

const passport = require('passport');
const GoogleStrategy = require('passport-google-oauth20').Strategy;

passport.use(new GoogleStrategy({
  clientID: 'YOUR_CLIENT_ID',
  clientSecret: 'YOUR_CLIENT_SECRET',
  callbackURL: '/auth/google/callback'
}, (accessToken, refreshToken, profile, done) => {
  // User authentication logic here
}));