A faithful Dart port of highlight.js — syntax highlighting with language auto-detection.

• 192 languages — All highlight.js language definitions ported to Dart
• Pure Dart — No Flutter dependency. Works in CLI tools, servers, and any Dart environment
• Auto-detection — Automatically detect the programming language
• HTML output — Generate highlighted HTML matching highlight.js format
• highlight.js test suite — Verified against the highlight.js markup test suite

import 'package:highlight/highlight.dart';

void main() {
  ensureInitialized();

  // Highlight with a specific language
  final result = hljs.highlight(
    'def hello():\n    print("Hello!")',
    language: 'python',
  );
  print(result.toHtml());

  // Auto-detect language
  final auto = hljs.highlightAuto('SELECT * FROM users WHERE id = 1;');
  print('Detected: ${auto.language}'); // sql
  print(auto.toHtml());
}

For smaller bundle sizes, import only the languages you need:

import 'package:highlight/highlight_core.dart';
import 'package:highlight/languages/dart.dart' as lang_dart;
import 'package:highlight/languages/python.dart' as lang_python;

void main() {
  final h = Highlight();
  h.registerLanguage('dart', lang_dart.dart);
  h.registerLanguage('python', lang_python.python);

  final result = h.highlight('void main() {}', language: 'dart');
  print(result.toHtml());
}

Highlight code with a specific language. Returns a HighlightResult.

Auto-detect language and highlight. Optionally restrict to a subset of languages.

Register a language definition.

List all registered language names.

• value / toHtml() — The highlighted HTML string
• language — The language used
• relevance — Confidence score

For Flutter apps, use the companion package flutter_highlight, which provides HighlightView and the generated theme maps.

MIT