PrettyPrintMiddleware.php

<?php
/**
 * Allow pretty print with the query parameter ?pretty=true
 */
declare(strict_types=1);

namespace App\Http\Middleware;

use Illuminate\Http\JsonResponse;

/**
 * Class PrettyPrintMiddleware
 * @package App\Http\Middleware
 */
class PrettyPrintMiddleware
{
  /**
   * @var string the query parameter
   */
  const QUERY_PARAMETER = 'pretty';

  /**
   * Apply pretty print if designated
   * 
   * @param $request
   * @param \Closure $next
   * @return mixed
   */
  public function handle($request, \Closure $next)
  {
    $response = $next($request);
        
    if ($response instanceof JsonResponse) {
      if ($request->query(self::QUERY_PARAMETER) == 'true') {
        $response->setEncodingOptions(JSON_PRETTY_PRINT);
      }
    }
        
    return $response;
  }
}