In Laravel, the "CSRF token mismatch" error occurs when the CSRF token sent with an AJAX request does not match the CSRF token stored in the session. This error is a security measure implemented by Laravel to protect against Cross-Site Request Forgery (CSRF) attacks.

The CSRF token is automatically generated and included in forms and AJAX requests when using Laravel's built-in CSRF protection middleware. When you make multiple asynchronous AJAX requests simultaneously, it's possible for the tokens to get out of sync, leading to this error.

To resolve the "CSRF token mismatch" error in Laravel 5 when making multiple async AJAX requests, you can try the following solutions:

  1. Use Global AJAX Setup: Add the CSRF token as a default header to all your AJAX requests using the global AJAX setup. This ensures that the correct CSRF token is sent with every AJAX request.

    javascript
    $.ajaxSetup({ headers: { 'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content') } });

    Make sure you have a <meta> tag in your HTML's <head> section that contains the CSRF token value.

  2. Use Axios Interceptors (If Using Axios): If you are using Axios for AJAX requests, you can set up an Axios interceptor to automatically attach the CSRF token to each request.

    javascript
    import axios from 'axios'; axios.interceptors.request.use((config) => { const csrfToken = document.head.querySelector('meta[name="csrf-token"]').content; config.headers['X-CSRF-TOKEN'] = csrfToken; return config; });
  3. Synchronize AJAX Requests: If making multiple AJAX requests concurrently is not necessary, consider queuing or synchronizing them. You can use the .done() or .then() method to chain the AJAX requests and ensure they are executed sequentially.

    javascript
    $.ajax({ method: 'POST', url: '/some-api-endpoint', data: { /* Your data here */ }, }).done(() => { // Make the next AJAX request here });
  4. Use Laravel's CSRF Middleware Group: Ensure that your AJAX routes are protected by Laravel's CSRF middleware group. This middleware group includes the web middleware, which includes the CSRF middleware. This ensures that the CSRF token is checked for each AJAX request.

    php
    // routes/web.php Route::group(['middleware' => ['web']], function () { // Your AJAX routes here });
  5. Verify CSRF Token Manually (Not Recommended): If none of the above solutions work for your specific scenario, you can disable CSRF verification for specific routes or AJAX requests. However, this is not recommended as it weakens your application's security against CSRF attacks.

    To disable CSRF verification for a specific route, add the route to the $except array in App\Http\Middleware\VerifyCsrfToken middleware.

    php
    // app/Http/Middleware/VerifyCsrfToken.php protected $except = [ // Add your route(s) here ];

Remember that disabling CSRF protection for your application may lead to security vulnerabilities. Always ensure you have a secure and robust approach to handle CSRF tokens in your AJAX requests. The recommended solutions ensure that your application remains secure while handling multiple async AJAX requests in Laravel 5.

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