Laravel Custom Exception Handlers


Laravel throws a large number of exceptions and is very easy to customize them to suit our needs as required.

Note: These exceptions are most helpful if you’re building an API.

The code for common exception handler lies in the {project_root}/app/Exceptions/ folder, named Handler.php. The default file looks like this in Laravel 5.7.

<?php namespace App\Exceptions; use Exception; use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler; class Handler extends ExceptionHandler { /** * A list of the exception types that are not reported. * * @var array */ protected $dontReport = [ // ]; /** * A list of the inputs that are never flashed for validation exceptions. * * @var array */ protected $dontFlash = [ 'password', 'password_confirmation', ]; /** * Report or log an exception. * * @param \Exception $exception * @return void */ public function report(Exception $exception) { parent::report($exception); } /** * Render an exception into an HTTP response. * * @param \Illuminate\Http\Request $request * @param \Exception $exception * @return \Illuminate\Http\Response */ public function render($request, Exception $exception) { return parent::render($request, $exception); } }

Some of the common exceptions that we’re going to handle in this tutorial are AuthenticationException, MethodNotAllowedHttpException, ModelNotFoundException, NotAcceptableHttpException, NotFoundHttpException, PostTooLargeException, ValidationException.

Below is the explanation for each variable, functions and handler implemented.

protected $dontReport = [] is the array of exceptions that Laravel wouldn’t report. Here we’re going to mention the exceptions that we don’t want laravel to report.

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Customizing Laravel validation JSON message format

laravel request validation customize error message format

By default laravel gives a good enough JSON format for validation errors but what if you want to customize it?

#Original JSON format { "message": "The given data was invalid.", "errors": { "email": [ "Please enter email address." ], "password": [ "Please enter password." ] } }

But for this particular project I decided to change the format to this.

{ "success": false, "success_code": 400, "message": "Please enter email address.", "errors": [ { "field": "email", "message": "Please enter email address." }, { "field": "password", "message": "Please enter password." } ] }

To achieve this I created a ValidationException handler function in app/Exceptions/Handler.php which helped me catch all the exceptions raised as a result of failed validations.

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