Outlivo
ToolsGuidesGlossaryAboutPrivacyTerms
Outlivo

53 free online tools for developers, students, and creators. Fast, safe, and easy to use.

Popular Tools

JSON ToolkitPassword Security HubImage ToolkitPDF ToolkitDiff & Code CompareInvoice Generator

Categories

Developer ToolsFinance CalculatorsSEO UtilitiesDesign ToolsText ConvertersSecurity Tools

Help & Legal

All ToolsGuidesGlossaryAboutPrivacyTerms

© 2026 Outlivo. All rights reserved.

Crafted with♥by Pradhumn Pawar.
Dashboard
ToolsDeveloper ToolsJS/TS Formatter

JS/TS Formatter

Format your messy JavaScript or TypeScript code to make it neat.

Loading tool...

100% Client-Side PrivacyProcessed entirely in browser memory with zero server storage.
Instant Real-Time ExecutionZero latency data manipulation powered by Web APIs.
Free & UnrestrictedNo accounts, subscriptions, or daily usage limits.

Technical Overview: How JS/TS Formatter Works

The JS/TS Formatter beautifies and minifies JavaScript and TypeScript source code, formatting indentation, bracket spacing, semicolons, and quotes according to clean code standards.

Parses JavaScript (ES6+ / ES2024) and TypeScript syntax trees, enforcing consistent 2-space or 4-space indentation, line wrapping, comma placement, and bracket alignment without altering runtime code execution logic.

Practical Examples & Usage

Formatting Compact JavaScript Function

Input:function calculateTotal(items){let total=0;items.forEach(item=>{total+=item.price*item.qty});return total;}
Output:function calculateTotal(items) { let total = 0; items.forEach((item) => { total += item.price * item.qty; }); return total; }

Adds consistent line breaks, 2-space indentation, and readable bracket padding.

Real-World Applications & Use Cases

  • Formatting minified JavaScript bundles and scripts extracted from browser DevTools for debugging.
  • Standardizing code formatting across legacy codebases lacking automated ESLint/Prettier configs.
  • Cleaning up copied code snippets before pasting into technical documentation or pull requests.
  • Minifying small JavaScript snippets for embedding in HTML inline `<script>` tags.

How to use JS/TS Formatter

  1. Paste your unformatted JavaScript or TypeScript code into the left editor pane.
  2. Adjust your preferred formatting settings (e.g., Tab Width, Single Quotes, Trailing Commas).
  3. The code will automatically format in the right pane in real-time.
  4. Review the beautifully indented and standardized code output.
  5. Click "Copy Code" to paste it back into your IDE or code editor.

Edge Cases & Limitations

  • •Code with syntax errors (unclosed brackets, illegal tokens) will fail to format until syntax is corrected.
  • •Formatting does not perform variable renaming, tree-shaking, or polyfilling.
  • •JSX / TSX templates require valid closing tags for correct indentation parsing.

Recommended Best Practices

  • •Integrate automated formatters (Prettier) into pre-commit Git hooks for automated team-wide consistency.
  • •Keep functions small and modular with single responsibilities for optimal readability.
  • •Always test code execution after formatting complex asynchronous logic.

Frequently Asked Questions

Does this formatter use standard Prettier rules?

Yes, this tool utilizes the industry-standard Prettier formatting engine, ensuring your code adheres to widely accepted JavaScript stylistic guidelines.

Will formatting my code change its functionality?

No. A code formatter only alters whitespace, indentation, and stylistic syntax (like quotes). It mathematically guarantees that the execution logic of your code remains identical.

Can it format React JSX or TSX?

Yes, the parser is fully equipped to handle modern React frameworks, flawlessly formatting JSX and TSX syntax alongside standard JS/TS.

Related Tools

YAML to JSON
Change YAML text into JSON format. It is completely free and very easy to use.
SVG Toolkit
Make SVG files smaller and cleaner. It is completely free and very easy to use.
HTML Toolkit
Free online HTML toolkit to format, beautify, minify, escape, and preview HTML markup. Fast, client-side HTML tools with zero server tracking.
XML to JSON
Change XML data into JSON format. It is completely free and very easy to use.

Popular Utility Alternatives

URL & Query String Inspector
Break down a URL to inspect its parts. It is completely free and very easy to use.
Text Cleaner
Clean up messy text by removing extra spaces and empty lines.
Border Radius Generator
Free online CSS border radius generator. Visually customize 8-value rounded corners, organic shapes, and copy CSS border-radius styles instantly.
HTTP Status Codes
Look up what HTTP status codes mean. It is completely free and very easy to use.

Explore More Tool Categories

FinanceMediaPDFUtilitiesText