Sử dụng JWT ở nhiều ngôn ngữ lập trình

const jwt = require("jsonwebtoken");

var token = jwt.sign({ foo: 'bar' }, "mậtkhẩu");

try {
  var json = jwt.verify(token, "mậtkhẩu");
} catch(err) {
  // err
}

using JWT.Algorithms;
using JWT.Builder;
using JWT.Exceptions;

JwtBuilder tokenBuilder = JwtBuilder.Create();
tokenBuilder.WithAlgorithm(new HMACSHA256Algorithm()).WithSecret("mậtkhẩu");
tokenBuilder.AddClaim("user_id", 1)
    .AddClaim("iat", DateTimeOffset.UtcNow.ToUnixTimeSeconds())
    .AddClaim("exp", DateTimeOffset.UtcNow.AddDays(1).ToUnixTimeSeconds());
string token = tokenBuilder.Encode();

try
{
    JwtBuilder jsonBuilder = JwtBuilder.Create();
    jsonBuilder.WithAlgorithm(new HMACSHA256Algorithm()).WithSecret("mậtkhẩu");
    jsonBuilder.MustVerifySignature();
    string json = jsonBuilder.Decode(token);
}
catch (Exception ex)
{
    switch (ex)
    {
        case InvalidTokenPartsException:
        case TokenNotYetValidException:
            Console.WriteLine("Token is not valid yet");
            break;
        case TokenExpiredException:
            Console.WriteLine("Token has expired");
            break;
        case SignatureVerificationException:
            Console.WriteLine("Token has invalid signature");
            break;
        default: throw;
    }
}

include_once 'vendor/autoload.php';

use Firebase\JWT\JWT;
use Firebase\JWT\Key;

$payload = [
  'user_id' => 123,
  'iat' => time(),
];

$token = JWT::encode($payload, 'mậtkhẩu', 'HS256');

try {
  $jsonText = JWT::decode($token, new Key('mậtkhẩu', 'HS256'));
} catch (SignatureInvalidException $e) {
  // provided JWT signature verification failed.
} catch (BeforeValidException $e) {
  // provided JWT is trying to be used before "nbf" claim OR
  // provided JWT is trying to be used before "iat" claim.
} catch (ExpiredException $e) {
  // provided JWT is trying to be used after "exp" claim.
} catch (UnexpectedValueException $e) {
  // stuff
}