JustJWT

A simple JWT library for Dart with support for custom signature algorithms.

Library already supports HS256 and RS256 algorithms.

Usage

A simple encoding example:

import 'package:just_jwt/just_jwt.dart';

main() {
  var signers = {
    'HS256': createHS256Signer('secret')
    'RS256': createRS256Signer('<private key>'),
    // additional supported algorithms
  };
  
  // Creates JWT encoder which supports ONLY tokens with HS256 or RS256 alg.
  var encoder = new Encoder(signers);
  
  var jwt = new Jwt.HS256({'some': 'value'});
  // or var jwt = new Jwt.RS256({'some': 'value'});
  
  // Encodes JWT
  var encodedJwt = encoder.convert(jwt);
  print(encodedJwt);
}

A simple decoding example:

import 'package:just_jwt/just_jwt.dart';

main() {
  var verifiers = {
    'HS256': createHS256Verifier('secret'),
    'RS256': createRS256Verifier('<public key>'),
    // additional supported algorithms
  };
  
  // Creates decoder which support ONLY tokens with HS256 or RS256 alg.
  // Unsupported algorithm will cause an UnsupportedVerificationAlgError.
  var decoder = new Decoder(verifiers);
  
  var encodedJwt = new EncodedJwt('eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzb21lIjoidmFsdWUifQ==.ZHaHisAt9O9fcGFAFanEvsRjlSqAELN7NdXvue-E1PQ=');
  
  var jwt = decoder.convert(encodedJwt);
}

Custom algorithm

Algorithm name is always stored in JWT. Encoders/Decoders tries to find a Signer/Verifier by its name in signers/verifiers map.

To support custom algorithm, just implement a JWT interface and create your own Verifier/Signer.