ldc-crm/app/Http/Middleware/JsonOnly.php

<?php

namespace App\Http\Middleware;

use App\Lib\Helper;
use Closure;
use Illuminate\Http\Request;

class JsonOnly
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {
        // TODO reve v1 check when dropped
        if (!Helper::isRequestForApiV1($request) and !$request->isJson()) {
            abort(400);
        }

        return $next($request);
    }
}