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Middleware to detect if a POST parameter of a given type is present, and if it is a data URI string we convert it to an instance of UploadedFile and make it accessible via Laravel's Request class and the file handling methods there.
namespace App\Http\Middleware;
use Closure;
use Illuminate\Http\UploadedFile;
class DataUriToFile
* Handle an incoming request.
* @param \Illuminate\Http\Request $request
* @param \Closure $next
* @param string $field
* @return mixed
* @example Route::post()->middleware('DataUriToFile:image')
public function handle($request, Closure $next, string $field)
if ($request->has($field) && substr($request->{$field}, 0, 11) === 'data:image/') {
$dataUri = $request->{$field};
$tempFile = tempnam(sys_get_temp_dir(), 'laravel-data-uri-');
$file = file_get_contents($dataUri);
file_put_contents($tempFile, $file);
$fileMime = mime_content_type($tempFile);
// Add the converted file to request object
$field => new UploadedFile($tempFile, 'image', $fileMime, strlen($file)),
// Unset/remove the original parameter
return $next($request);
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carestad commented Jan 4, 2019

Please note that this does not currently work.

It does now!

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