php artisan make:request UserStoreRequest

<?php

namespace App\Http\Requests;

use Illuminate\Contracts\Validation\Validator;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Http\Exceptions\HttpResponseException;

class StoreUserRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'first_name' => 'required|string|max:255',
            'last_name' => 'required|string|max:255',
            'role' => 'required',
            'email' => ['required', 'string', 'email', 'max:255', 'unique:users'],
            'password' => ['required'],
        ];
    }


    protected function failedValidation(Validator $validator)
    {
        throw new HttpResponseException(response()->json([
            'errors' => $validator->errors(),
            'status' => true
        ], 422));
    }


}

Create Routes:

Route::get('user/create', 'HomeController@create');
Route::post('user/create', 'HomeController@store');

Create controller

app/Http/Controllers/HomeController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests\StoreUserRequest;
use App\User;

class HomeController extends Controller
{
    /**
     * Show the application dashboard.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        return view('createUser');
    }

    /**
     * Show the application dashboard.
     *
     * @return \Illuminate\Http\Response
     */
    public function store(StoreUserRequest $request)
    {
        $input = $request->all();
        $input['password'] = bcrypt($input['password']);
        $user = User::create($input);

        return response()->json(['message' => 'User created successfully']);
    }
}