push to github

.gitignore

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+# Files and directories created by pub
+.dart_tool/
+.packages
+
+# Omit commiting pubspec.lock for library packages:
+# https://dart.dev/guides/libraries/private-files#pubspeclock
+pubspec.lock
+
+# Conventional directory for build outputs
+build/
+
+# Directory created by dartdoc
+doc/api/

CHANGELOG.md

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+## 1.0.0
+
+- Initial version, created by Stagehand

README.md

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+A library for Dart developers.
+
+Created from templates made available by Stagehand under a BSD-style
+[license](https://github.com/dart-lang/stagehand/blob/master/LICENSE).
+
+## Usage
+
+A simple usage example:
+
+```dart
+import 'package:jsonwebtoken/jsonwebtoken.dart';
+
+main() {
+  var awesome = new Awesome();
+}
+```
+
+## Features and bugs
+
+Please file feature requests and bugs at the [issue tracker][tracker].
+
+[tracker]: http://example.com/issues/replaceme

example/example.dart

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+import 'package:jsonwebtoken/jsonwebtoken.dart';
+
+main() {
+  final jwt = JWT(payload: {
+    'hello': 'world',
+    'iat': 1590774250,
+  });
+
+  final token = jwt.sign(key: 'test');
+
+  print(token);
+}

lib/jsonwebtoken.dart

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+library jsonwebtoken;
+
+export 'src/jsonwebtoken.dart';

lib/src/jsonwebtoken.dart

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+import 'dart:convert';
+
+import 'package:crypto/crypto.dart';
+
+enum Algorithm {
+  HS256,
+  RS256,
+}
+
+class JWT {
+  JWT({
+    this.payload,
+  });
+
+  static String secretKey = null;
+
+  Map<String, dynamic> payload;
+  String audience;
+  String subject;
+  String issuer;
+
+  String signedToken;
+
+  String sign({
+    String key,
+    Algorithm algorithm = Algorithm.HS256,
+    Duration expiresIn = const Duration(days: 7),
+    bool noTimestamp = false,
+  }) {
+    if (key == null && JWT.secretKey != null) key = JWT.secretKey;
+    assert(key != null);
+
+    final headers = {'alg': algorithm.toString().split('.').last, 'typ': 'JWT'};
+    final encodedHeader = _base64Unpadded(_jsonToBase64Url.encode(headers));
+    final encodedPayload = _base64Unpadded(_jsonToBase64Url.encode(payload));
+
+    final body = encodedHeader + '.' + encodedPayload;
+
+    final signature = _base64Unpadded(base64Url.encode(_sign(body, key)));
+
+    return body + '.' + signature;
+  }
+
+  List<int> _sign(String body, String key) {
+    final hmac = Hmac(sha256, utf8.encode(key));
+    return hmac.convert(utf8.encode(body)).bytes;
+  }
+
+  final _jsonToBase64Url = json.fuse(utf8.fuse(base64Url));
+
+  String _base64Unpadded(String value) {
+    if (value.endsWith('==')) return value.substring(0, value.length - 2);
+    if (value.endsWith('=')) return value.substring(0, value.length - 1);
+    return value;
+  }
+
+  static JWT verify(String token) {}
+}

pubspec.yaml

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+name: jsonwebtoken
+description: A starting point for Dart libraries or applications.
+version: 1.0.0
+homepage: https://www.example.com
+
+environment:
+  sdk: '>=2.7.0 <3.0.0'
+
+dependencies:
+  crypto: ^2.1.5