JWT "Signature verification failed" with PHP - php

Question

I am using Firebase/JWT with php. I am trying to read the token in "decoded" php file but it shows be Signature verification failed not sure why that is happening. This is how I am encoding the token
<?php
use \Firebase\JWT\JWT;
require 'vendor/autoload.php';
require('config/Database.php');
$db = new Database;
$key = "helloworld";
//$jwt = JWT::encode($token, $key, 'HS512');
$post = file_get_contents("php://input");
$postdata = json_decode($post);
if($postdata){
$email = $postdata->email;
$password = $postdata->password;
$query = "SELECT * FROM users WHERE email = :email";
$db->query($query);
$db->bind(":email", $email);
$rows = $db->resultset();
if(password_verify($password, $rows[0]["hash"])){
$rows[0]["Success"] = "Success";
$token = array(
"rows" => $rows
);
$jwt = JWT::encode($token, $key, 'HS256');
header("auth: " . $jwt);
echo json_encode($jwt, 128);
}else{
echo "Failed";
}
}
?>
Then I am decoding the token in this file
<?php
use \Firebase\JWT\JWT;
require 'vendor/autoload.php';
require('config/Database.php');
$db = new Database;
$key = "helloworld";
//$jwt = JWT::encode($token, $key, 'HS512');
$post = file_get_contents("php://input");
$postdata = json_decode($post);
if($postdata){
$userData = $postdata->userdata;
// check if token is same stored in the database then decode
$jwt = JWT::decode($userData, $key, array('HS256'));
echo $jwt;
}
?>
It fails, returning a "Signature verification failed" error.
Any help is appreciated. Thank you.

Answer 1

The problem why it wasn't verifying was because I was using json_encode on the jwt and that caused it to be wrapped around quotes again so the token looked something like this ""eY0lkajflajk...."" and that caused the verifying exception. Thank you #zerkms for bring that up.