Auth

Login with Twitch

To enable Twitch Auth for your project, you need to set up a Twitch Application and add the Application OAuth credentials to your Supabase Dashboard.

Overview

Setting up Twitch logins for your application consists of 3 parts:

Access your Twitch Developer account

  • Go to dev.twitch.tv.
  • Click on Log in with Twitch at the top right to log in.
  • If you have not already enabled 2-Factor Authentication for your Twitch Account, you will need to do that at Twitch Security Settings before you can continue.

Twitch Developer Page

Twitch Developer Console

Find your callback URL

The next step requires a callback URL, which looks like this: https://<project-ref>.supabase.co/auth/v1/callback

  • Go to your Supabase Project Dashboard
  • Click on the Authentication icon in the left sidebar
  • Click on Providers under the Configuration section
  • Click on Twitch from the accordion list to expand and you'll find your Callback URL, you can click Copy to copy it to the clipboard

Create a Twitch application

Twitch Developer Console

  • Click on + Register Your Application at the top right.

Register Application

  • Enter the name of your application.
  • Type or paste your OAuth Redirect URL (the callback URL from the previous step.)
  • Select a category for your app.
  • Check the CAPTCHA box and click Create.

Retrieve your Twitch OAuth client ID and client secret

  • Click Manage at the right of your application entry in the list.

Twitch Applications List

  • Copy your Client ID.
  • Click New Secret to create a new Client Secret.
  • Copy your Client Secret.

Get Client ID and Secret

Add your Twitch credentials into your Supabase project

  • Go to your Supabase Project Dashboard
  • In the left sidebar, click the Authentication icon (near the top)
  • Click on Providers under the Configuration section
  • Click on Twitch from the accordion list to expand and turn Twitch Enabled to ON
  • Enter your Twitch Client ID and Twitch Client Secret saved in the previous step
  • Click Save

Add login code to your client app

When your user signs in, call signInWithOAuth() with twitch as the provider:

async function signInWithTwitch() {
const { data, error } = await supabase.auth.signInWithOAuth({
provider: 'twitch',
})
}

For a PKCE flow, for example in Server-Side Auth, you need an extra step to handle the code exchange. When calling signInWithOAuth, provide a redirectTo URL which points to a callback route. This redirect URL should be added to your redirect allow list.

In the browser, signInWithOAuth automatically redirects to the OAuth provider's authentication endpoint, which then redirects to your endpoint.

await supabase.auth.signInWithOAuth({
provider,
options: {
redirectTo: `http://example.com/auth/callback`,
},
})

At the callback endpoint, handle the code exchange to save the user session.

Create a new file at app/auth/callback/route.ts and populate with the following:

app/auth/callback/route.ts
import { NextResponse } from 'next/server'
// The client you created from the Server-Side Auth instructions
import { createClient } from '@/utils/supabase/server'

export async function GET(request: Request) {
const { searchParams, origin } = new URL(request.url)
const code = searchParams.get('code')
// if "next" is in param, use it as the redirect URL
const next = searchParams.get('next') ?? '/'

if (code) {
const supabase = await createClient()
const { error } = await supabase.auth.exchangeCodeForSession(code)
if (!error) {
const forwardedHost = request.headers.get('x-forwarded-host') // original origin before load balancer
const isLocalEnv = process.env.NODE_ENV === 'development'
if (isLocalEnv) {
// we can be sure that there is no load balancer in between, so no need to watch for X-Forwarded-Host
return NextResponse.redirect(`${origin}${next}`)
} else if (forwardedHost) {
return NextResponse.redirect(`https://${forwardedHost}${next}`)
} else {
return NextResponse.redirect(`${origin}${next}`)
}
}
}

// return the user to an error page with instructions
return NextResponse.redirect(`${origin}/auth/auth-code-error`)
}

When your user signs out, call signOut() to remove them from the browser session and any objects from localStorage:

async function signOut() {
const { error } = await supabase.auth.signOut()
}

Resources