JS Code Formatter

A developer tool that formats JavaScript code to a consistent style, improving readability and collaboration for teams and solo programmers.

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We're working hard to get this tool ready for you.

Request Feature / Support
1,032+
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 JS 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 JavaScript code to a consistent style, enabling teams to maintain readable, homogeneous codebases. Conceptually, it parses source into an abstract syntax tree (AST), then reprints the code with user-configured rules such as indentation, semicolon usage, and quote style. This approach preserves semantics while adjusting whitespace, line breaks, and token presentation. Benefits include faster code reviews, easier onboarding, and reduced style violations. Core features include AST-based formatting, comment preservation, deterministic output, and configurable style options. Use cases span pre-commit formatting, CI validation, and editor integrations where consistent presentation matters more than manual styling. By separating required formatting rules from advanced options, teams can start with a simple setup and expand with multi-file formatting, line-length caps, and language-agnostic printers if needed. The tool’s value proposition rests on reliability, speed, and ease of adoption, delivering predictable formatting across contributors and environments. Unique differentiators include strong AST handling to avoid semantical changes, explicit preservation of comments and blank lines, and a clear separation between essential formatting rules and optional, project-specific preferences.

How to Use

Provide inputs: paste JavaScript code and choose initial formatting rules.
Configure formatting style: set indent_size, semicolon usage, and quote_style.
Run formatting: execute the format operation to produce formatted_code.
Review outputs: inspect the formatted_code and any diagnostic messages for parse issues.
Export or copy: save the formatted result to a file or clipboard for integration into your workflow.

How to use code formatter online js

Frequently Asked Questions

Find Quick Answers

What types of JavaScript syntax are supported?
The formatter supports standard JavaScript syntax up to modern ES features and common JSX-like constructs. It preserves comments and avoids changing runtime behavior; unsupported syntax may trigger an error or fallback to a best-effort print.
What happens on syntax errors?
If the input cannot be parsed, the tool returns an error with location details and leaves the original code unchanged. This avoids introducing unintended changes in your source.
Can I enforce project-wide standards automatically?
Yes. Provide a configuration set (indentation, semicolons, quotes, line length) and apply it across files or commits. The formatter will consistently reprint code to match the configured style, reducing drift during collaboration.

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