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OAuth with PKCE flow for SSR

Learn how to configure OAuth authentication in your server-side rendering (SSR) application to work with the PKCE flow.

Setting up SSR client

Check out our guide for creating a client to learn how to install the necessary packages, declare environment variables, and create a Supabase client configured for SSR in your framework.

Create API endpoint for handling the code exchange

In order to use OAuth we will need to setup a endpoint for the code exchange, to exchange an auth code for the user's session, which is set as a cookie for future requests made to Supabase.

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

app/auth/callback/route.ts

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import { cookies } from 'next/headers'
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import { NextResponse } from 'next/server'
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import { type CookieOptions, createServerClient } from '@supabase/ssr'
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export async function GET(request: Request) {
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const { searchParams, origin } = new URL(request.url)
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const code = searchParams.get('code')
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// if "next" is in param, use it as the redirect URL
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const next = searchParams.get('next') ?? '/'
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if (code) {
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const cookieStore = cookies()
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const supabase = createServerClient(
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process.env.NEXT_PUBLIC_SUPABASE_URL!,
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process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
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{
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cookies: {
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get(name: string) {
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return cookieStore.get(name)?.value
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},
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set(name: string, value: string, options: CookieOptions) {
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cookieStore.set({ name, value, ...options })
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},
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remove(name: string, options: CookieOptions) {
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cookieStore.delete({ name, ...options })
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},
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},
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}
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)
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const { error } = await supabase.auth.exchangeCodeForSession(code)
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if (!error) {
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return NextResponse.redirect(`${origin}${next}`)
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}
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}
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// return the user to an error page with instructions
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return NextResponse.redirect(`${origin}/auth/auth-code-error`)
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}

Let's point our .signInWithOAuth method's redirect to the callback route we create above:


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