Free online JavaScript formatter and beautifier. Format and beautify JS code with configurable indentation, semicolon style (always/omit), and brace placement. Detects syntax errors and highlights problematic code patterns. Perfect for cleaning up minified or messy scripts. 100% browser-based.
100% browser-based — your data never leaves your device
Format and beautify JavaScript code with configurable indentation.
Copy your JavaScript code and paste it into the input area.
Select your indentation style and semicolon preference.
Click Format, then Copy to grab the beautified JavaScript for your project.
Ctrl+Enter to format
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JavaScript Formatter is a free online text tool that format and beautify javascript code with configurable indentation. It works entirely in your browser — no downloads, no installations, and no server uploads required. content writers, developers, technical writers use JavaScript Formatter when they need a fast, privacy-respecting way to process text data without installing additional software. It supports capabilities such as smart formatting, semicolon style, error detection. Additional features include copy ready. Common use cases include beautifying minified javascript for debugging and code review, formatting code consistently across a team for better readability, cleaning up auto-generated or compiled javascript output. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes JavaScript Formatter ideal for working with sensitive data, proprietary code, or any situation where privacy matters.
JavaScript Formatter is a free online text tool that helps you format and beautify javascript code with configurable indentation. Key capabilities include smart formatting, semicolon style, error detection. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to beautifying minified javascript for debugging and code review.
Copy your JavaScript code and paste it into the input area.
Select your indentation style and semicolon preference.
Click Format, then Copy to grab the beautified JavaScript for your project.
| Category | Details |
|---|---|
| Input Limits | Maximum input length: Browser memory bound |
| Encoding support: UTF-8, UTF-16, ASCII, ISO-8859-1, Windows-1252 | |
| Supported Formats | Plain text, UTF-8, ASCII, Unicode, Percent-encoding (RFC 3986) |
| Browser Engine |
|
All operations run entirely in your browser using built-in Text APIs. No server uploads, no data storage, and no third-party requests.
JavaScript Formatter is ideal when you need to beautifying minified javascript for debugging and code review without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For for advanced text manipulation within an IDE, consider using VS Code. For for batch text processing on servers, sed/awk (command-line) may be a better fit. JavaScript Formatter fills the gap between heavyweight desktop tools and insecure online services that require uploading your data.
No. JavaScript Formatter processes everything entirely in your browser using JavaScript. Nothing you type, paste, or upload is ever transmitted to any server. Your data never leaves your device.
It adds line breaks after semicolons and braces, indents code blocks, and preserves comments and strings. The formatter handles basic structures like functions, loops, conditionals, and object literals.
The formatter checks for unmatched braces {}, parentheses (), and brackets []. It tracks string literals, template literals, and comments to avoid false positives.
Auto-indents code blocks, aligns assignments, and formats function declarations.
Option to add or remove semicolons based on preference.
Highlights syntax errors: unmatched braces, missing parentheses, invalid tokens.
Copy formatted JavaScript to clipboard with one click.
JavaScript Formatter is useful in a variety of scenarios across different workflows:
Beautifying minified JavaScript for debugging and code review
Formatting code consistently across a team for better readability
Cleaning up auto-generated or compiled JavaScript output
Choose a coding style (semicolons vs no semicolons, tabs vs spaces) and apply it consistently. This tool helps maintain uniformity across your codebase.
Always format minified JavaScript before debugging. Source maps help, but formatted code is much easier to step through and understand.
Explore more tools in the Text workspace:
Word Counter
Count words, characters, sentences, and paragraphs in your text instantly.
Character Counter
Count characters, words, sentences, and paragraphs in your text with real-time character analysis.
Slug Generator
Generate URL-friendly slugs from any text. Supports multiple separator styles.
Lorem Ipsum Generator
Generate placeholder text for your design and development projects.
URL Encode/Decode
Encode or decode URLs and query strings with proper percent-encoding.
URL Query Parser
Parse URL query parameters into a readable key-value table.