How to flash validation errors to session in Laravel - laravel

Question

The built in behavior for flashing back validation errors in Laravel does not seem to be working for my use case.
I have a (React) form that posts it's data via fetch API using this method, which reloads or redirects the page with (hopefully) any session data after the response is returned:
fetch(props.register_route, {
method: 'POST',
headers: {
'X-CSRF-Token': props.csrf,
},
body: data,
})
.then((result) => {
return result.json();
})
.then((result) => {
console.log(result);
window.location.href = result.url;
},
(error) => {
console.log(error);
});
In my controller, I validate this data but if I structure it as follows, the errors are not available as $errors in the resulting page
if ($validator->fails()) {
return redirect()->back()->withErrors($validator);
}
However if I manually flash the errors to the session and return a url instead of a redirect, suddenly the behavior works.
if ($validator->fails()) {
Session::flash('errors', $validator->errors());
return response->json([
'url' => route('register'),
], Response::HTTP_NOT_ACCEPTABLE);
}
I feel as if I must be doing something incorrectly here to have to use this workaround. I could also manually send the errors back in the response, which may be the right way to structure things in the long run.

Answer 1

when you are calling api from javascript or front end applications like Reactjs,Angular,android etc.. .So it expect return result should be in json format so it should be like
if ($validator->fails()) {
return response()->json( $validator->errors(),422);
}

Answer 2

if you not calling Method from direct laravel blade then pass response in JOSN Format.
like
https://laravel.com/docs/8.x/responses#json-responses
Or
make one ResponseManager File
<?PHP
namespace App\Libraries\utils;
class ResponseManager {
public static $response = array('flag' => true, 'data' => '', 'message' => '', 'code' => 01,);
public static function getError($data = '', $code = 10, $message = '', $flag = false) {
self::$response['flag'] = $flag;
self::$response['code'] = $code;
self::$response['data'] = $data;
self::$response['message'] = $message;
return self::$response;
}
public static function getResult($data = '', $code = 10, $message = '', $flag = true) {
self::$response['flag'] = $flag;
self::$response['code'] = $code;
self::$response['data'] = $data;
self::$response['message'] = $message;
return self::$response;
}}
Define in config/app.php
//custom class
'ResponseManager' => App\Libraries\utils\ResponseManager::class,
and then use in whole project
Error Message Like
if ($validation->fails()) {
$message = $validation->messages()->first();
return Response()->json(ResponseManager::getError('', 1, $message));
}
Success Message Like
return Response()->json(ResponseManager::getResult(null, 10, "Success"));