Code Block Formatter

Formats and prettifies code snippets across languages for clean, consistent documentation and reviews.

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1,756+

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 Code Block 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 accepts a code snippet and a language, then applies deterministic formatting rules to produce consistent blocks for docs and tutorials. It supports common languages and block formats, preserves comments and string literals, and enforces indentation and line-length constraints.
It uses language-aware logic or AST-based heuristics to reflow and reindent while preserving the original semantics of the code.
Users include developers, technical writers, and educators who maintain code samples in READMEs, API docs, and tutorials. The unique value lies in configurable presets and non-destructive formatting that adapts to project-specific style guides, ensuring uniform appearance across repositories. Core features include indentation control, wrap column enforcement, language presets, and preservation of comments and literals. Use cases cover README code blocks, documentation snippets, and sample configurations. The tool operates without executing code and does not analyze runtime behavior, focusing only on structural formatting to improve readability and consistency.

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How to Use

Provide inputs: code snippet, language, and desired formatting options.
Configure style: set indent_size, wrap_column, and whether to preserve trailing whitespace.
Run formatting: trigger the formatter to produce formatted_code.
Review outputs: examine the formatted block for consistency with project guidelines.
Copy or export: copy to clipboard or export to a file for documentation pipelines.

Frequently Asked Questions

Find Quick Answers

Which languages are supported?

The tool supports major languages such as Python, JavaScript, JSON, YAML, Java, C++, and other common formats through language-aware parsing. If a language is not explicitly supported, a generic formatter applies whitespace normalization while preserving tokens and literals.

Can I customize formatting style?

Yes. You can adjust indent_size, wrap_column, and enable language-specific presets. You can also supply a project style configuration to guide consistent block formatting across samples.

Does formatting alter code semantics?

No. The formatter rewrites whitespace, indentation, and line breaks only. It preserves tokens, strings, comments, and overall structure; it does not execute or analyze runtime behavior.

Is there an API or integration option?

Yes. The tool offers a programmatic API for embedding in docs pipelines or CI processes. It accepts inputs and returns formatted_code and metadata for downstream processing.

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