How to Resolve Error Code 12500 in Google Sign-In

Troubleshooting Google Sign-In Issues

You may run into issues that prevent users from logging in when you use React Native to integrate Google Sign-In with your Android application. The error code 12500, which denotes a non-recoverable sign-in failure, is a frequent problem. Whenever you modify the email address or client ID in your code, this problem frequently happens.

It is essential to comprehend the underlying reasons and fixes for this problem in order to preserve a seamless user authentication process. We'll go over how to identify and resolve the issue in this tutorial so that the Google Sign-In feature of your app continues to be dependable and strong.

Command	Description
GoogleSignin.configure()	Sets the client ID provided to the Google Sign-In service.
GoogleSignin.hasPlayServices()	Determines whether the device is capable of using Google Play Services.
GoogleSignin.signIn()	Starts the Google Sign-In procedure and, if successful, returns user data.
api.post()	Sends the supplied data along with a POST request to the designated endpoint.
OAuth2Client.verifyIdToken()	Confirms the user's identity by looking up the Google ID token.
ticket.getPayload()	Retrieved the user data payload from the authenticated ID token.
useNavigation()	Allows for navigation between React Native elements.
useEffect()	Runs a side effect in React components that are functional, such setting up Google Sign-In.

Comprehending the Google Sign-In Process

The first script sets up and starts a React Native application's Google Sign-In. It sets up the Google Sign-In service with the given client ID using the technique. The function verifies whether Google Play Services are installed on the device, which is necessary for the sign-in procedure. The method initiates the sign-in process if Play Services are available and returns user information after successful authentication. The script then creates a login payload using the user's name and email address, which is then delivered via the api.post function to the backend for additional processing.

The Google ID token that was obtained from the client is validated on the backend by the Node.js script. It verifies the token's authenticity against the supplied client ID using the technique. The function retrieves user data from the token after successful verification. To verify validity, the script then compares the email received in the request with the email from the payload. In the event that the emails match, it logs the user in by simulating a database interaction and replies to the client. To make sure that only legitimate users may use the application, if the verification is unsuccessful, an error message is sent.

import { GoogleSignin } from '@react-native-google-signin/google-signin';
import { useState, useEffect } from 'react';
import { View, Button, Alert } from 'react-native';
import api from './api';
import { useNavigation } from '@react-navigation/native';

const CLIENT_ID = 'YOUR_NEW_CLIENT_ID';

const GoogleSignIN = () => {
  const [loading, setLoading] = useState(false);
  const navigation = useNavigation();

  useEffect(() => {
    GoogleSignin.configure({ androidClientId: CLIENT_ID });
  }, []);

  const signIn = async () => {
    try {
      await GoogleSignin.hasPlayServices();
      const userInfo = await GoogleSignin.signIn();
      const socialLoginData = { email: userInfo.user.email, name: userInfo.user.name };
      setLoading(true);

      const res = await api.post('/Auth/login-single-signin', socialLoginData);
      if (res.data.ack === 1) {
        navigation.navigate('DrawerNavigation');
      } else {
        navigation.navigate('VerifyEmail', { msg: res.data.message });
      }
    } catch (error) {
      Alert.alert('Sign In Error', error.message);
    } finally {
      setLoading(false);
    }
  };

  return (
    <View>
      <Button
        title={loading ? 'Signing In...' : 'Sign In with Google'}
        onPress={signIn}
        disabled={loading}
      />
    </View>
  );
};

export default GoogleSignIN;

const express = require('express');
const bodyParser = require('body-parser');
const { OAuth2Client } = require('google-auth-library');
const CLIENT_ID = 'YOUR_NEW_CLIENT_ID';
const client = new OAuth2Client(CLIENT_ID);
const app = express();

app.use(bodyParser.json());

app.post('/Auth/login-single-signin', async (req, res) => {
  const { email, name } = req.body;
  try {
    // Verify the ID token using Google's OAuth2Client
    const ticket = await client.verifyIdToken({
      idToken: req.body.token,
      audience: CLIENT_ID,
    });
    const payload = ticket.getPayload();

    if (payload.email === email) {
      // Simulate database interaction for login
      const user = { email, name, ack: 1 };
      res.status(200).json(user);
    } else {
      res.status(401).json({ ack: 0, message: 'Email verification failed' });
    }
  } catch (error) {
    res.status(500).json({ ack: 0, message: error.message });
  }
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

Fixing Google Sign-In Problems with React Native

Make sure your app's SHA-1 fingerprint is properly set up in the Google Developer Console as one factor to take into account when fixing the Google Sign-In issue 12500. Because Google uses the SHA-1 fingerprint to confirm the legitimacy of your app, it is essential to the authentication process. An erroneous or missing SHA-1 could result in an unsuccessful sign-in attempt with the error code 12500.

Making sure the OAuth consent screen is configured correctly is another crucial step. Make sure you have filled in all the essential fields and that the scopes your application requires have been defined appropriately. Errors like 12500 can also result from misconfiguration of the OAuth consent screen settings, which might cause authentication problems. For smooth user authentication, these configurations must be accurate and up to date.

1. The Google Sign-In error 12500: What is the cause?
2. The most common causes of error 12500 in the Google Developer Console include incorrect settings for the client ID, SHA-1 fingerprint, or OAuth consent screen.
3. How can I resolve the 12500 Google Sign-In error?
4. Verify that the Google Developer Console's and are configured appropriately. Check the settings on the OAuth consent screen as well.
5. Why is a SHA-1 fingerprint required for Google Sign-In?
6. Google ensures that the sign-in request originates from a reliable source by using the SHA-1 fingerprint to confirm the legitimacy of the app making the request.
7. How do I set up my application's SHA-1 fingerprint?
8. In the Google Developer Console, you may set up the SHA-1 fingerprint in the project's credentials area.
9. If my OAuth consent screen is not set up correctly, what should I do?
10. Make that the OAuth consent screen settings in the Google Developer Console have all the essential information filled out and the necessary scopes configured.
11. Can issues with Google Sign-In be caused by wrong scopes?
12. Authentication issues may occur if the scopes that your application requires are not properly defined on the OAuth consent page.
13. If I create a new keystore, does the SHA-1 fingerprint need to be updated as well?
14. It is true that you must update the SHA-1 fingerprint in the Google Developer Console if you build a new keystore for your application.
15. What are the best ways to handle React Native Google Sign-In errors?
16. Make sure your code handles errors gracefully, check that all setups in the Google Developer Console are valid, and give users clear instructions on how to fix authentication problems.

Concluding the Google Sign-In Problem

Setting up your client ID and SHA-1 fingerprint carefully in the Google Developer Console is necessary to fix the Google Sign-In problem number 12500. Just as crucial is making sure your OAuth consent screen is configured correctly. These methods will help you avoid irreversible sign-in errors and give your users a flawless authentication experience. Make sure you validate all settings.

Maintaining the integrity and security of your application can be achieved by routinely upgrading and verifying your Google Sign-In setup. By putting these best practices into effect, problems will be solved immediately and mistakes won't happen again.