Better Auth•3w ago

OAuth with TikTok failing — “code_challenge” error on redirect

Hi! I’m integrating BetterAuth in my Next.js app with a custom PostgreSQL schema via Prisma. Everything works fine locally, but when I try to sign in with the TikTok provider on my deployed Vercel app, I’m redirected to a TikTok error page saying: “An error occurred. TikTok login failed. This may be due to application-specific settings. If you’re a developer, fix the following and try again: code_challenge.” I’m not doing any manual PKCE handling in my code, and I assumed BetterAuth manages it internally. Here’s my current BetterAuth config:

export const auth = betterAuth({
  database: prismaAdapter(prisma, { provider: "postgresql" }),
  emailAndPassword: { enabled: true },
  socialProviders: {
    tiktok: {
      clientId: process.env.TIKTOK_CLIENT_ID,
      clientSecret: process.env.TIKTOK_CLIENT_SECRET,
      clientKey: process.env.TIKTOK_CLIENT_KEY,
    },
  },
});

export const auth = betterAuth({
  database: prismaAdapter(prisma, { provider: "postgresql" }),
  emailAndPassword: { enabled: true },
  socialProviders: {
    tiktok: {
      clientId: process.env.TIKTOK_CLIENT_ID,
      clientSecret: process.env.TIKTOK_CLIENT_SECRET,
      clientKey: process.env.TIKTOK_CLIENT_KEY,
    },
  },
});

Also, my signIn call looks like this:

await signIn.social(
  {
    provider: "tiktok",
    callbackURL: "/dashboard/settings",
  },
  {
    onRequest: () => setLoading(true),
    onResponse: () => setLoading(false),
  }
);

await signIn.social(
  {
    provider: "tiktok",
    callbackURL: "/dashboard/settings",
  },
  {
    onRequest: () => setLoading(true),
    onResponse: () => setLoading(false),
  }
);

Is there something I’m missing regarding PKCE or TikTok support on BetterAuth? Thanks a lot for your help!

3 Replies

iPheNoMeNaL-oG•2w ago

@Julien 🍁 You figure this out? Running into this now as well

Julien 🍁OP•2w ago

no 😞

iPheNoMeNaL-oG•5d ago

@Julien 🍁 I cannot seem to find a solution or even really what the issue is woah I got it to work

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OAuth with TikTok failing — “code_challenge” error on redirect

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