Passing user_meta in POST body doesn't work

[Weeb]

First of all, thanks for a great plugin!

Bug Description

Passing "user_meta" in POST body as JSON doesn't work, for example:

"user_meta": {
"billing_first_name": "Billy-Bob",
"billing_last_name": "Thornton"
}

However it works if passing it as a string via URL parameter, which can get quite messy if dealing with more meta.

I've managed to fix it by directly editing RegisterUserService.php (around line 77) and checking if
$this->request['user_meta'] is an array before running json_decode.

Environment

Question	Answer
PHP version	7.4.10
WordPress version	5.9
Simple-JWT-Login plugin version	3.4.2

Additional Context (optional)

[Lupul]

I was able to reproduce this issue too, json in body is already decoded in ParseRequest.php:L51

simple-jwt-login/simple-jwt-login/src/Libraries/ParseRequest.php

Line 51 in aa4dd19

$variables = json_decode($content, true);