React Code Formatter

A web-based formatter for React and JavaScript code, enabling developers to quickly standardize formatting and improve readability.

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2,548+
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 React 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 provides a web-based formatter for React and JavaScript code. It accepts raw code input, language selection (JavaScript, TypeScript, JSX/TSX), and an optional configuration to apply preferred styling. Internally, it parses the code into an AST and prints it with deterministic whitespace and conventions. It is designed for developers, code reviewers, and teams seeking repeatable formatting across projects without requiring local tooling or setup. The formatter emphasizes React-ready handling for JSX/TSX constructs, including component hierarchies, props, and fragments, while preserving runtime semantics. It outputs a single, nicely styled code block that can be copied, exported, or integrated into workflows. Unique value lies in React-awareness, speed, and a minimal configuration surface that still supports advanced options when needed. Core features include language-aware formatting, indentation control, quote style, semi-colon handling, and line-length enforcement, with optional support for custom print widths and trailing comma configurations. Use cases include PR preparation, documentation snippets, and onboarding new contributors, where consistent style reduces cognitive load during code reviews. The tool differentiates itself by prioritizing React-friendly formatting, providing a lightweight, repeatable web-based solution that complements CI pipelines or ad-hoc code prep tasks without requiring local installs.

How to Use

  1. Provide inputs by pasting code or uploading a file.
  2. Select language (JavaScript, TypeScript, JSX/TSX) and a formatting profile if available.
  3. Configure options: indentation, quotes, semicolons, and max line length.
  4. Run formatting to generate formatted_code.
  5. Copy, download, or integrate the formatted output into your workflow.
How to use online code formatter react

Frequently Asked Questions

Find Quick Answers

Which languages and syntactic forms are supported?
The tool supports JavaScript, TypeScript, JSX, and TSX with React-aware formatting that respects component structure, props, and fragments; it can format embedded template literals and modern syntax.
Can I customize the formatter rules?
Yes. You can specify indentation size and type, quote style, semicolon preference, and a line length cap; you may also supply a config to mirror Prettier-like rules or to align with your project guidelines.
How are errors handled?
When parse errors exist, the formatter attempts to format valid sections and reports diagnostics for problematic regions; outputs include partial formatting with an explanation of issues and fallback options.

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