Dart code formatter

Formats Dart code to standard style, improving readability and consistency for teams across IDEs, editors, and CI workflows.

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584+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how Dart code formatter processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}

Computed Result

{
  "id": 1,
  "status": "active",
  "roles": [
    "admin"
  ]
}

Execution Mode Client-Side In-Browser JS

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About This Tool

The tool formats Dart code to the canonical Dart style, consolidating indentation, line breaks, and brace placement. It targets Dart developers, IDE plugins, and CI workflows needing a consistent baseline before sharing or merging code. Output is a clean, readable snippet that aligns with Dart language guidelines and reduces review time.
Conceptually, the formatter parses the input Dart source, applies the standard printer rules, and reprints the code with normalized spacing. It preserves comments and doc comments, formats collection literals and parameter lists with trailing commas, and respects a configurable line length when provided. The system delegates formatting decisions to the underlying Dart formatter so results are deterministic and idempotent.
Use cases include preparing snippets for documentation, automating pre-commit checks, and ensuring consistency across multi-developer projects. Unique value lies in its adherence to the official Dart style, which minimizes stylistic disputes and speeds up code reviews. Core features include single-snippet formatting with optional line-length control, comment preservation, and safe handling of multiline strings. Optional batch formatting is achievable by applying the formatter repeatedly to multiple inputs in a pipeline.
This tool is well-suited for editor integrations, CI pipelines, and educational contexts where learners need immediate feedback on Dart formatting.

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How to Use

Provide inputs: supply a Dart code string as the main input.
Configure options: set an optional line_length if desired.
Run formatting: invoke the formatter to produce a canonical version of the code.
Review outputs: retrieve formatted_code and use it in editors or repositories.
Validate results: ensure syntax remains correct after formatting.

Frequently Asked Questions

Find Quick Answers

What input does the formatter accept?

The tool accepts a Dart source code string as input. It formats the code according to the Dart style guidelines and returns a formatted code string. If the input contains syntax errors, a parse_error is provided to guide corrections.

Will formatting change the code semantics?

No. The formatter only changes whitespace, indentation, and line breaks to conform to style guidelines. It does not alter identifiers, control flow, or runtime semantics.

Can I format multiple files at once?

Yes. Apply the formatter to each Dart source input in sequence or batch-process a collection of inputs in a pipeline. Each result is a separate formatted_code output with its own potential parse_error.

Does the formatter preserve comments and doc comments?

Yes. The formatter preserves inline comments, block comments, and documentation comments to maintain intent and readability while applying styling rules.

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