Paste messy JSON and get a clean, indented, readable result in one click. Everything runs locally — your data never leaves the tab.
FORMAT
Tips
Paste JSON in the left pane. Output updates instantly.
JSON processing runs entirely in your browser using the native JSON.parse and JSON.stringify APIs. Output updates instantly as you type — no server round-trip needed.
All processing happens inside your browser tab. The JSON you paste or type is never sent to a server — it stays entirely on your device.
No. The formatting is done with JavaScript's built-in JSON.parse and JSON.stringify — entirely in your browser.
Two spaces by default, which is the most common convention.
The tool will show a clear error message pointing to where the syntax breaks.