Better AuthBA
Better Auth•9mo ago
ak11

Invalid Callback URL on expo IOS when doing Google oauth

Hello everyone,

I’m trying out Better Auth and I’m running into an issue with my google oauth.

Error:
2025-04-12T14:00:21.709Z ERROR [Better Auth]: Invalid callbackURL: business-copilot:///
2025-04-12T14:00:22.223Z INFO [Better Auth]: If it's a valid URL, please add business-copilot:/// to trustedOrigins in your auth config
 Current list of trustedOrigins: exp://,http://localhost:8081
 ERROR  {"code": "INVALID_CALLBACKURL", "message": "Invalid callbackURL", "status": 403, "statusText": ""}


package version:
"@better-auth/expo": "^1.2.6-beta.8",
"better-auth": "1.2.6-beta.6",



Relevant code:

app.json
"scheme": "business-copilot",


auth.ts
trustedOrigins: ['exp://'],
socialProviders: {
  google: {
    clientId: process.env.GOOGLE_CLIENT_ID as string,
    clientSecret: process.env.GOOGLE_CLIENT_SECRET as string,
  },
},


authClient.ts
export const authClient = createAuthClient({
  baseURL:
    process.env.BETTER_AUTH_URL /* base url of your Better Auth backend. */,
  disableDefaultFetchPlugins: true,
  plugins: [
    expoClient({
      scheme: 'business-copilot',
      storage: SecureStore,
    }),
    organizationClient(),
    anonymousClient(),
    phoneNumberClient(),
  ],
});


Sign-in.tsx
const onGoogleButtonPress = useCallback(async () => {
  const { error, data } = await authClient.signIn.social({
    provider: 'google',
    callbackURL: '/recent-businesses',
  });
  if (error) {
    console.error(error);
  }
}, []);


Behaviour:
Web: works as expected
On iOS (and android I guess): throws error relating to the scheme

Please can someone help me out. I would very much appreciate
Solution
add business-copilot:/// as a trusted origin in your auth config
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