Dart Code Formatter

Dart Code Formatter

Paste your Dart or Flutter source and instantly get a cleanly formatted version that follows the conventions enforced by dart format. The formatter runs entirely in your browser — no SDK install, no upload, and no waiting on a remote server. It is a fast, deterministic helper for every situation where you want spec-compliant output without leaving the page.

Comment utiliser

1. Paste your Dart or Flutter code into the input area, or click Essayez un exemple to load a sample.
2. Pick your preferred indent size (2 spaces is the dart_style default, but 4 spaces and tabs are supported).
3. Glisser le Longueur de ligne slider — the formatter will warn you about lines that exceed your target.
4. Basculer Sort and group directives, Ajout de virgules finaleset Collapse blank lines as needed.
5. Cliquez Format and copy or download the cleaned-up source.

Caractéristiques

• Configurable line length — slider from 40 to 160 characters, defaulting to the official 80.
• dart_style-inspired indentation — supports 2 spaces, 4 spaces, or tabs.
• Directive grouping — sorts and groups dart:, package:, and relative imports with a blank line between groups.
• Virgules finales — adds a trailing comma to multi-line argument and parameter lists, exactly like Flutter widget trees expect.
• Null-safety aware — preserves ?., !, ??et ??= with the correct spacing.
• String-safe — single, double, triple, and raw (r"…") string literals are left untouched.
• Comment-safe — line, block, and dartdoc (///) comments are preserved and reflowed cleanly.
• Top-level spacing — inserts a blank line between top-level declarations for readability.
• Traitement côté client à 100 % — your code never leaves the browser, so it is safe for proprietary code.

Cas d'utilisation

• Quick clean-up of a snippet pasted from a Stack Overflow answer or a chat message.
• Revues de code on GitHub or GitLab where you want to compare normalized output before commenting on style.
• Onboarding new developers who do not yet have the Dart SDK installed locally.
• Pre-commit sanity check when you want to compare your editor’s output to a second-opinion formatter.
• Flutter widget trees where consistent trailing commas keep diff noise low.