TemplateController.php

<?php

namespace App\Http\Controllers;

use App\Template;

class TemplateController extends Controller
{
    /**
     * Create a new contract.
     *
     * @param  \Illuminate\Http\Request $request
     * @return \App\Template
     */
    public function create(Requets $request)
    {
        return Template::create($request->validate([
            'text' => 'required|string',
            'variables' => 'required|json',
            'variables.*' => 'required|string'
        ]);
    }
}