Customize Exception Handler For API

Laravel 8 and below:

There's a method render() in App\Exceptions class:

public function render($request, Exception $exception)
 {
     if ($request->wantsJson() || $request->is('api/*')) {
         if ($exception instanceof ModelNotFoundException) {
             return response()->json(['message' => 'Item Not Found'], 404);
         }
 
         if ($exception instanceof AuthenticationException) {
             return response()->json(['message' => 'unAuthenticated'], 401);
         }
 
         if ($exception instanceof ValidationException) {
             return response()->json(['message' => 'UnprocessableEntity', 'errors' => []], 422);
         }
 
         if ($exception instanceof NotFoundHttpException) {
             return response()->json(['message' => 'The requested link does not exist'], 400);
         }
     }
 
     return parent::render($request, $exception);
 }

Laravel 9 and above:

There's a method register() in App\Exceptions class:

public function register()
{
    $this->renderable(function (ModelNotFoundException $e, $request) {
        if ($request->wantsJson() || $request->is('api/*')) {
            return response()->json(['message' => 'Item Not Found'], 404);
        }
    });
 
    $this->renderable(function (AuthenticationException $e, $request) {
        if ($request->wantsJson() || $request->is('api/*')) {
            return response()->json(['message' => 'unAuthenticated'], 401);
        }
    });
    $this->renderable(function (ValidationException $e, $request) {
        if ($request->wantsJson() || $request->is('api/*')) {
            return response()->json(['message' => 'UnprocessableEntity', 'errors' => []], 422);
        }
    });
    $this->renderable(function (NotFoundHttpException $e, $request) {
        if ($request->wantsJson() || $request->is('api/*')) {
            return response()->json(['message' => 'The requested link does not exist'], 400);
        }
    });
}