Laravel 5.4 - Custom default validation error output and status code to 400

readme.md

What's the problem?

In laravel 5.4, when using $this->validate() function, it will give the default errors format with 422 status code as below.

{
  "username": [
    "The username field is required."
  ],
  "email": [
    "The email field is required."
  ],
  "fullname": [
    "The fullname field is required."
  ]
}

So how?

As refer to docs and this post, I try to come with solution on override App\Http\Controllers\Controller on two methods as to get the below output with 400 status code.

[
  "The username field is required.",
  "The email field is required.",
  "The fullname field is required."
]

App\Http\Controllers\Controller.php

<?php

namespace App\Http\Controllers;

use Illuminate\Foundation\Bus\DispatchesJobs;
use Illuminate\Routing\Controller as BaseController;
use Illuminate\Foundation\Validation\ValidatesRequests;
use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
use Illuminate\Validation\Validator;

use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class Controller extends BaseController
{
    use AuthorizesRequests, DispatchesJobs, ValidatesRequests;
    
    // custom error message display
    protected function formatValidationErrors(Validator $validator)
    {
        return $validator->errors()->all();
    }
    
    // custom validation error status code to 400 (instead of 422)
    protected function buildFailedValidationResponse(Request $request, array $errors)
    {
        if ($request->expectsJson()) {
            return new JsonResponse($errors, 400);
        }

        return redirect()->to($this->getRedirectUrl())
                        ->withInput($request->input())
                        ->withErrors($errors, $this->errorBag());
    }
}