Codeigniter 4 Google ReCaptcha V2 Example

Registration form with google v2 recaptcha in codeigniter 4 example; In this tutorial, i will guide you step by step on how to implement registration form with google v2 recaptcha in codeigniter 4 app using google apis.

Note that google v2 or v3 reCAPTCHA protects your website from fraud and abuse.

If you are creating a form in codeigniter 4 app. And you want to protect your form with the help of Google v2 Recaptcha. So in this tutorial you will learn how to integrate Google v2 Recaptcha with your codeigniter 4 forms.

Before start this tutorial, you need to create google reCaptcha key or secret. Click here for creating a google reCaptcha key or secret.

Google ReCaptcha v2 Form in CodeIgniter 4 Example

  • Install Codeigniter 4 Application
  • Basic App Configurations
  • Create Database And Table
  • Connect App to Database
  • Create Model & Controller Class
  • Create Views
  • Setup Routes
  • Start Development server

Step 1 – Install Codeigniter 4 Application

First of all, you need to ownload the latest version of Codeigniter 4. So, visit this link Download Codeigniter 4 app and unzip the setup in your local system xampp/htdocs/ .

Note that, please change the download folder name “demo”.

Step 2 – Basic App Configurations

Now, you need to some basic configuration on the app/config/app.php file, so let’s go to application/config/config.php and open this file on text editor.

Set Base URL like this

public $baseURL = 'http://localhost:8080';
public $baseURL = 'http://localhost/demo/';

Step 3 – Create Database And Table

Create database and tables by executing the following query:

    id int(11) NOT NULL AUTO_INCREMENT COMMENT 'Primary Key',
    name varchar(100) NOT NULL COMMENT 'Name',
    email varchar(255) NOT NULL COMMENT 'Email Address',
    contact_no varchar(50) NOT NULL COMMENT 'Contact No',
    created_at varchar(20) NOT NULL COMMENT 'Created date',
    PRIMARY KEY (id)
  ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='datatable demo table' AUTO_INCREMENT=1;


Step 4 – Connect App to Database

To connect your codeigniter 4 app to the database. So, visit app/Config/ directory and open Database.php. Then add the databasae details like below into database.php file:

public $default = [
        'DSN'      => '',
        'hostname' => 'localhost',
        'username' => 'test',
        'password' => '4Mu99BhzK8dr4vF1',
        'database' => 'demo',
        'DBDriver' => 'MySQLi',
        'DBPrefix' => '',
        'pConnect' => false,
        'DBDebug'  => (ENVIRONMENT !== 'development'),
        'cacheOn'  => false,
        'cacheDir' => '',
        'charset'  => 'utf8',
        'DBCollat' => 'utf8_general_ci',
        'swapPre'  => '',
        'encrypt'  => false,
        'compress' => false,
        'strictOn' => false,
        'failover' => [],
        'port'     => 3306,

Step 5 – Create Model & Controller Class

Create UserModel.php file. So, visit app/Modelsdirectory and create UserModel.php.Then add the following code into it:

<?php namespace App\Models;
use CodeIgniter\Database\ConnectionInterface;
use CodeIgniter\Model;

class UserModel extends Model
    protected $table = 'contacts';

    protected $allowedFields = ['name', 'email'];

Create GoogleReCaptcha.php file. So, visit app/Controllers directory and create GoogleReCaptcha.php.Then add the following code into it:

<?php namespace App\Controllers;
use CodeIgniter\Controller;
use CodeIgniter\HTTP\RequestInterface;
use App\Models\UserModel;

class GoogleReCaptcha extends Controller

    public function index(){
      return view('home');

    public function googleCaptach() {

      $model = new UserModel();
      $data = array('name' => $this->request->getVar('name'),
                    'email' => $this->request->getVar('email'), 
                    'contact_no' => $this->request->getVar('mobile_number'), 
      $recaptchaResponse = trim($this->request->getVar('g-recaptcha-response'));
      $credential = array(
            'secret' => $secret,
            'response' => $this->request->getVar('g-recaptcha-response')

      $verify = curl_init();
      curl_setopt($verify, CURLOPT_URL, "");
      curl_setopt($verify, CURLOPT_POST, true);
      curl_setopt($verify, CURLOPT_POSTFIELDS, http_build_query($credential));
      curl_setopt($verify, CURLOPT_SSL_VERIFYPEER, false);
      curl_setopt($verify, CURLOPT_RETURNTRANSFER, true);
      $response = curl_exec($verify);

      $status= json_decode($response, true);
       $session->setFlashdata('msg', 'Form has been successfully submitted');
       $session->setFlashdata('msg', 'Something goes to wrong');
      return redirect()->to('/');


Step 6 – Create Views

Create home.php view file, so visit app/views/ directory and create home.php file. Then add the following HTML into list.php file:

<!doctype html>
<html lang="en">
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <title>Codeigniter Google Recaptcha Form Validation Example -</title>
  <link rel="stylesheet" href="" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
  <script src="" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
  <script src="" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
  <script src="" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
  <script src=''></script>
   .error{ color:red; } 
<div class="container">
    <div class="error"><strong><?=$this->session->flashdata('msg')?></strong></div>
    <div class="row">
    <div class="col-md-9">
    <form  method="post" action="<?php echo base_url('captcha-v2') ?>">
      <div class="form-group">
        <label for="formGroupExampleInput">Name</label>
        <input type="text" name="name" class="form-control" id="formGroupExampleInput" placeholder="Please enter name">

      <div class="form-group">
        <label for="email">Email Id</label>
        <input type="text" name="email" class="form-control" id="email" placeholder="Please enter email id">

      <div class="form-group">
        <label for="mobile_number">Mobile Number</label>
        <input type="text" name="mobile_number" class="form-control" id="mobile_number" placeholder="Please enter mobile number" maxlength="10">
      <div class="g-recaptcha" data-sitekey="YOUR_SITE_KEY"></div>  
      <div class="form-group">
       <button type="submit" id="send_form" class="btn btn-success">Submit</button>

Step 7 – Setup Routes

To define a route, So, visit app/Config/ directory and open Routes.php file. Then add the following routes into it:

$routes->get('/', 'GoogleReCaptcha::index');
$routes->post('captcha-v2', 'GoogleReCaptcha::googleCaptach');

Step 8 – Start Development server

Execute the following command into command prompt or terminal to start the codeigniter 4 application:

php spark serve

Then visit your web browser and hit the following url on it:





Registration form with google v2 recaptcha in codeigniter 4 example; In this tutorial, you have learned how to implement registration form with google v2 recaptcha in codeigniter 4 app using google apis.

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