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About This Tool

The JavaScript Formatter a comprehensive javascript formatting, minification, and validation engine for onlinedevtools. All processing happens client-side in your browser, ensuring your data remains private and secure. Perfect for developers who need quick, reliable processing without compromising on privacy or security.

How to Use This Tool

Input Your JavaScript

Paste your JavaScript code into the input area. The formatter handles minified JavaScript, inconsistently formatted code, or code with mixed indentation. Load sample data to see formatting in action.

Choose Formatting Style

Select your preferred indentation (2 spaces, 4 spaces, or tabs) and other JavaScript formatting preferences. The tool applies industry-standard JavaScript style guidelines but can be customized to match your project's standards.

Copy Formatted Output

Formatted JavaScript appears instantly in the output panel. Use the "Copy" button for clipboard, or "Download" to save as a file. The formatted JavaScript is fully functional with dramatically improved readability.

Technical Implementation

This tool is built using modern JavaScript and runs entirely in your web browser. All operations complete in milliseconds for typical inputs, with performance optimized for both speed and accuracy. The implementation is client-side only - your data never leaves your device. The tool works offline once loaded, requires no cookies, and includes no tracking. Supported browsers include Chrome 90+, Firefox 88+, Safari 14+, and Edge 90+. The tool is mobile-responsive and works on tablets and smartphones.

Best Practices & Tips

✓Format JavaScript before code reviews. Clean, consistently formatted code is easier to review and helps reviewers focus on logic rather than style issues.
✓Use consistent indentation across your team. Choose 2 spaces, 4 spaces, or tabs for JavaScript and stick with it. This formatter makes it easy to enforce your team's standard.
✓Format minified JavaScript for debugging. When debugging production issues, format the minified code first to make it human-readable. This tool handles even heavily compressed JavaScript.
✓Combine with validation. Always validate JavaScript after formatting to ensure no errors were introduced. Use our JavaScript validator alongside this formatter.

Troubleshooting Common Issues

Problem: Formatted output has syntax errors

Solution: The formatter preserves your original JavaScript content exactly - it only changes whitespace and indentation. If output has errors, the input likely had errors. Validate first, then format.

Example: If your minified JavaScript had missing commas, formatting will make them more visible but won't fix them.

Problem: Indentation doesn't match my preference

Solution: Check the indentation settings (2 spaces, 4 spaces, or tabs). The formatter applies your chosen style consistently throughout the JavaScript.

Example: If you want 4-space indentation but see 2 spaces, change the setting and re-format.