# oauth2

***

**1. Google OAuth2 Login**

```javascript
const {OAuth2Client} = require('google-auth-library');
const client = new OAuth2Client(process.env.GOOGLE_CLIENT_ID);

app.get('/auth/google', passport.authenticate('google', {
  scope: ['profile', 'email']
}));

app.get('/auth/google/callback', passport.authenticate('google', {
  successRedirect: '/profile',
  failureRedirect: '/login'
}));
```

**2. Facebook OAuth2 Login**

```javascript
const passport = require('passport');
const FacebookStrategy = require('passport-facebook').Strategy;

passport.use(new FacebookStrategy({
  clientID: process.env.FACEBOOK_APP_ID,
  clientSecret: process.env.FACEBOOK_APP_SECRET,
  callbackURL: '/auth/facebook/callback'
},
(accessToken, refreshToken, profile, done) => done(null, profile)));

app.get('/auth/facebook', passport.authenticate('facebook'));

app.get('/auth/facebook/callback', passport.authenticate('facebook', {
  successRedirect: '/profile',
  failureRedirect: '/login'
}));
```

**3. Twitter OAuth2 Login**

```javascript
const passport = require('passport');
const TwitterStrategy = require('passport-twitter').Strategy;

passport.use(new TwitterStrategy({
  consumerKey: process.env.TWITTER_CONSUMER_KEY,
  consumerSecret: process.env.TWITTER_CONSUMER_SECRET,
  callbackURL: '/auth/twitter/callback'
},
(token, tokenSecret, profile, done) => done(null, profile)));

app.get('/auth/twitter', passport.authenticate('twitter'));

app.get('/auth/twitter/callback', passport.authenticate('twitter', {
  successRedirect: '/profile',
  failureRedirect: '/login'
}));
```

**4. GitHub OAuth2 Login**

```javascript
const passport = require('passport');
const GitHubStrategy = require('passport-github').Strategy;

passport.use(new GitHubStrategy({
  clientID: process.env.GITHUB_CLIENT_ID,
  clientSecret: process.env.GITHUB_CLIENT_SECRET,
  callbackURL: '/auth/github/callback'
},
(accessToken, refreshToken, profile, done) => done(null, profile)));

app.get('/auth/github', passport.authenticate('github'));

app.get('/auth/github/callback', passport.authenticate('github', {
  successRedirect: '/profile',
  failureRedirect: '/login'
}));
```

**5. LinkedIn OAuth2 Login**

```javascript
const passport = require('passport');
const LinkedInStrategy = require('passport-linkedin').Strategy;

passport.use(new LinkedInStrategy({
  clientID: process.env.LINKEDIN_CLIENT_ID,
  clientSecret: process.env.LINKEDIN_CLIENT_SECRET,
  callbackURL: '/auth/linkedin/callback'
},
(accessToken, refreshToken, profile, done) => done(null, profile)));

app.get('/auth/linkedin', passport.authenticate('linkedin'));

app.get('/auth/linkedin/callback', passport.authenticate('linkedin', {
  successRedirect: '/profile',
  failureRedirect: '/login'
}));
```

**6. Discord OAuth2 Login**

```javascript
const passport = require('passport');
const DiscordStrategy = require('passport-discord').Strategy;

passport.use(new DiscordStrategy({
  clientID: process.env.DISCORD_CLIENT_ID,
  clientSecret: process.env.DISCORD_CLIENT_SECRET,
  callbackURL: '/auth/discord/callback'
},
(accessToken, refreshToken, profile, done) => done(null, profile)));

app.get('/auth/discord', passport.authenticate('discord'));

app.get('/auth/discord/callback', passport.authenticate('discord', {
  successRedirect: '/profile',
  failureRedirect: '/login'
}));
```

**7. Twitch OAuth2 Login**

```javascript
const passport = require('passport');
const TwitchStrategy = require('passport-twitch').Strategy;

passport.use(new TwitchStrategy({
  clientID: process.env.TWITCH_CLIENT_ID,
  clientSecret: process.env.TWITCH_CLIENT_SECRET,
  callbackURL: '/auth/twitch/callback'
},
(accessToken, refreshToken, profile, done) => done(null, profile)));

app.get('/auth/twitch', passport.authenticate('twitch'));

app.get('/auth/twitch/callback', passport.authenticate('twitch', {
  successRedirect: '/profile',
  failureRedirect: '/login'
}));
```

**8. Spotify OAuth2 Login**

```javascript
const passport = require('passport');
const SpotifyStrategy = require('passport-spotify').Strategy;

passport.use(new SpotifyStrategy({
  clientID: process.env.SPOTIFY_CLIENT_ID,
  clientSecret: process.env.SPOTIFY_CLIENT_SECRET,
  callbackURL: '/auth/spotify/callback'
},

```