Laravel 5 JSON Validation Rule

JsonValidation.php

<?php namespace App\Services;

use Illuminate\Validation\Validator;

class JsonValidation extends Validator{

    private $_customMessages  = array(
        "json" => "The :attribute attribute is not valid JSON.",
    );

    public function __construct( $translator, $data, $rules, $messages = array(), $customAttributes = array() ) {
        parent::__construct( $translator, $data, $rules, $messages, $customAttributes );

        $this->setCustomMessages($this->_customMessages);
    }

    /**
     * Allow valid json string
     * @param $attribute
     * @param $value
     * @param $parameters
     * @return bool
     */
    public function validateJson($attribute, $value, $parameters)
    {
        json_decode($value);
        return (json_last_error() == JSON_ERROR_NONE) ? true : false;
    }

}

JsonValidationServiceProvider.php

<?php namespace App\Providers;

use App\Services\JsonValidation;
use Illuminate\Support\ServiceProvider;
use Validator;

class JsonValidationServiceProvider extends ServiceProvider{

    public function register(){}

    public function boot()
    {
        Validator::resolver(function($translator, $data, $rules, $messages)
        {
            return new JsonValidation($translator, $data, $rules, $messages);
        });
    }
}

Laravel 5 Json Validation Rule

Laravel provides many useful and generic validation rules. But what if we want more? What if we need something more specific for example if we need validation for a valid json string from inputs?
We can use this JsonValidation class wich extends Laravel base Validation class.

Installation:
Copy JsonValidation.php file in App\Services folder.
Copy JsonValidationServiceProvider.php file in App\Provider folder.
Register provider in config\app.php $providers array:
'App\Providers\JsonValidationServiceProvider',

Usage:
In your validation rules you can use 'json' rule ex:
$rules = [ 'your_input' => 'json' ];