Online Code Formatter

Formats code with language-aware rules to produce clean, consistent style for developers, students, and teams, improving readability and easing code reviews.

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1,332+
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 Online 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 code using language-aware rules to ensure consistent style across a range of programming languages. It processes an input code_text and applies language-specific indentation, line breaks, and spacing to produce a clean, readable form. Conceptually, it relies on a parser or heuristic for each supported language to build a representation of the code and then reprint it with standardized formatting. This reduces cognitive load during reviews and collaboration, and helps teams enforce style guidelines. It benefits developers who work across languages, educators preparing samples, and students learning proper formatting. Core features include deterministic formatting, configurable indentation, wrap length, and the option to auto-detect language. The tool distinguishes between code and non-code regions (comments, strings) to preserve semantics while adjusting presentation. It can generate diagnostics when a snippet cannot be formatted with full language rules, guiding follow-up edits. The value lies in improved readability, faster reviews, and consistent presentation of code across repositories and projects. Use cases include preparing code samples for documentation, standardizing code blocks in tutorials, and enabling automated pre-commit formatting in CI pipelines. The formatter aims for idempotence: repeatedly formatting a snippet should yield the same result. Advanced users can supply per-language presets to align with team style guides.

How to Use

  1. Provide inputs: paste code_text and optionally specify language and formatting options.
  2. Configure rules: set indent_size, use_tabs, wrap_after, line_ending.
  3. Run formatting: apply the formatter to generate formatted_code.
  4. Review outputs: check formatted_code and diagnostics for syntax concerns.
  5. Export: copy, download, or integrate formatted_code into your workflow.
  6. Optional: adjust presets and re-run for different styles.
How to use online code editor formatter

Frequently Asked Questions

Find Quick Answers

Which languages are supported?
The tool supports common languages such as JSON, JavaScript, TypeScript, Python, Java, and C/C++; for others, formatting uses generic heuristics with best-effort results. Accuracy depends on available parser support and language rules.
Does it preserve comments?
Yes. The formatter preserves line and block comments and positions them relative to code blocks; it avoids changing semantics inside string literals and complex constructs to maintain correctness.
Can I save and reuse presets?
Yes. Advanced presets allow per-language styling, including indent size and line length. Presets can be saved to projects and reused to ensure consistent formatting across files.

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