Private & local
All formatting and conversion happens in your browser. Nothing is uploaded, logged, or stored — your data never leaves your device.
JSON Formatter
Format, minify, and convert JSON online — free, fast, private. Supports JSON to YAML, XML, TOML. All processing happens in your browser.
JSON Formatter
Paste JSON below — it formats instantly. Switch tabs to minify, or convert to YAML, XML, or TOML.
Formatted JSON will appear here as you type...How to use the JSON Formatter
Three simple steps — no signup, no upload, no waiting.
- Paste your raw JSON into the Input area on the left. You can paste minified, messy, or deeply nested JSON — the tool handles it all.
- Your JSON is automatically formatted as a collapsible tree view on the right. Click +/- to expand or collapse nested objects and arrays. If your JSON has a syntax error, the exact character is highlighted in red in the input area.
- Use the tabs to switch output formats — Format (tree view), Minify (single line), YAML, XML, or TOML. Click Copy to copy the result to your clipboard.
Features
A local JSON formatter built for developers and everyday use.
Auto-update as you type
No need to click a button. Output refreshes automatically while you type, with a short debounce for smooth performance.
Precise error highlighting
Unlike most tools that only show a vague error message, this formatter highlights the exact character in your input where the JSON syntax breaks — so you can fix it instantly.
Frequently asked questions
Common questions about JSON formatting and how our tool works.
What is JSON formatting?
JSON formatting (or "pretty printing") takes compressed, hard-to-read JSON and adds indentation, line breaks, and spacing to make it human-readable. Our tool does this automatically with a collapsible tree view so you can navigate deeply nested structures easily.
Can I convert JSON to other formats?
Yes. Use the tabs above the output area to switch between Format (tree view), Minify (single line), YAML, XML, and TOML. All conversions happen in your browser — no data is sent anywhere.
What happens if my JSON has an error?
If your JSON contains a syntax error (missing comma, unclosed bracket, trailing comma, etc.), the exact character position is highlighted in red in your input. An error message appears below the input area describing what went wrong. Fix the error and the output updates automatically.
Is my data safe? Where is it processed?
Absolutely. All processing — parsing, formatting, and format conversion — happens entirely in your browser using JavaScript. Your JSON data never leaves your device. Nothing is uploaded, stored, or transmitted to any server.
What are the limitations of YAML/XML/TOML conversion?
These are best-effort conversions. YAML output uses standard indentation and handles nested structures well. XML uses <root> as the top-level element with keys as element names. TOML uses dotted key paths for nested objects. For production use, always verify converted output. Note: JSON-specific types like null may render differently in each target format.