How to implement reCaptcha into a flutter app

How to Implement reCAPTCHA into a Flutter App

reCAPTCHA is a popular service provided by Google that helps protect websites and apps from spam and abuse. It uses a variety of techniques, including image recognition and natural language processing, to distinguish between humans and bots. In this blog post, we will show you how to implement reCAPTCHA into a Flutter app.

Prerequisites

Before you begin, you will need the following:

• A Google account
• A Flutter project
• The flutter_recaptcha_v2 plugin

Step 1: Register for a reCAPTCHA Key

To use reCAPTCHA, you will need to register for a key. You can do this by visiting the reCAPTCHA Admin Console. Once you have registered, you will be given a site key and a secret key. Keep these keys safe, as you will need them later.

Step 2: Add the flutter_recaptcha_v2 Plugin

To add the flutter_recaptcha_v2 plugin to your Flutter project, follow these steps:

1. Open your pubspec.yaml file and add the following line:

dependencies:
  ...
  flutter_recaptcha_v2: ^1.0.0

2. Run the following command in your terminal:

flutter pub get

Step 3: Configure the Plugin

Once you have added the plugin, you will need to configure it. To do this, open your main.dart file and add the following code:

import 'package:flutter/material.dart';
import 'package:flutter_recaptcha_v2/flutter_recaptcha_v2.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // TODO: Replace this with your site key
  final String _siteKey = 'your_site_key';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Recaptcha(
                siteKey: _siteKey,
                onVerified: (token) {
                  // TODO: Implement your verification logic here
                },
              ),
            ],
          ),
        ),
      ),
    );
  }
}

Step 4: Verify the reCAPTCHA Token

Once the user has completed the reCAPTCHA challenge, you will need to verify the token. You can do this by sending the token to your server. Your server can then use the token to verify that the user is not a bot.

Conclusion

In this blog post, we have shown you how to implement reCAPTCHA into a Flutter app. By following these steps, you can help protect your app from spam and abuse.