JavaScript Minifier and Beautifier for Real Developer Workflows
When you deploy JavaScript, you usually want compact output to reduce payload size and parse time. When you debug third-party scripts, API clients, or production snippets, you need readable code you can scan quickly. This tool handles both in one place: beautify for readability and minify for compact output.
It also includes a dedicated JSON mode, so you can clean up API payloads and config blobs without switching between tools.
If you want a quick refresher on language syntax, see MDN JavaScript Guide and the JSON specification (RFC 8259).
If you’re documenting code examples, pair this with Markdown to HTML Converter for publishing and HTML to Markdown Converter when migrating existing docs.
Why This Tool Is Useful
- Fast debugging: Beautify compressed JavaScript into readable structure.
- Smaller payload checks: Minify snippets to validate production-like output quickly.
- JS + JSON in one place: Switch modes instead of jumping across tabs and tools.
- Safer sharing: Copy formatted output for code review, tickets, or documentation.
- Private by design: Processing runs fully in your browser.
Key Features
JavaScript and JSON Mode Switch
Choose the mode based on your input type:
- JavaScript mode for scripts, functions, and app logic
- JSON mode for API responses, config objects, and test fixtures
Beautify and Minify Actions
Switch instantly between two common needs:
- Beautify: Adds line breaks and indentation for readability
- Minify: Removes unnecessary whitespace and compresses output
These actions follow the same practical goals used by popular formatter/minifier ecosystems like Prettier and Terser.
Live Convert and Manual Control
Keep Live Convert enabled for immediate feedback while editing. Turn it off when working with larger snippets and run conversion only when needed.
Copy and Download
Use one-click actions to:
- Copy output directly into your clipboard
- Download result as
.jsor.jsonfor local workflows
Inline Error Feedback
If your input is invalid, the tool returns clear parse/processing errors so you can correct syntax quickly.
Common Use Cases
Debugging Minified Production Snippets
Paste compressed code from a browser source map fallback or network response, beautify it, and inspect logic quickly.
Cleaning API Payloads for Docs
Switch to JSON mode to format payload examples before sharing in tickets, handoffs, or technical documentation. For deep validation and advanced JSON workflows, use JSON Formatter & Validator, and for table-style review, use JSON to Table Converter.
Preparing Snippets for Blogs and Tutorials
Beautify JavaScript examples before publishing so readers can follow code flow without friction.
Pre-Review Code Hygiene
Normalize formatting before code review to reduce noise and focus feedback on logic rather than spacing.
Script + Pattern Validation Workflow
If your script includes parsing or extraction logic, validate patterns in Regex Tester before shipping final code.
How to Use
- Select JavaScript or JSON mode
- Paste input code/data into the editor
- Choose Beautify or Minify
- Keep live mode on for instant updates, or run manually
- Copy or download the output
Best Practices for Better Results
Validate Syntax Before Minifying
Minification works best when input is already syntactically valid. If output fails, beautify first and inspect the area around the reported error.
Keep JSON and JavaScript Separate
Use JSON mode for pure data payloads and JavaScript mode for executable code. This helps avoid parser mismatches.
Use Beautified Output in Reviews
For PR discussions and bug reports, readable output helps reviewers identify behavior faster than compressed code. If you need to sanitize encoded request payloads before sharing, use Base64 Encoder/Decoder.
Minify Only Near Final Delivery
Do active debugging with beautified code, then minify as a final optimization step.
Privacy and Security
This tool is fully client-side. Your JavaScript and JSON are processed in your browser and are not uploaded to a remote server.
Frequently Asked Questions
What’s the difference between beautify and minify?
Beautify improves readability with indentation and spacing. Minify removes unnecessary whitespace to reduce size.
Can I use this for JSON and JavaScript in the same session?
Yes. Switch modes at any time using the mode toggle.
Why am I seeing an error after pasting input?
Most errors come from invalid syntax (missing commas/braces, malformed strings, or mixed JSON/JS input). Ensure the selected mode matches your content, and check common JSON parse errors.
Is my code sent to a server?
No. Processing happens locally in your browser.
Can I export the output as a file?
Yes. Use the download action to save output as .js or .json.