Giga Useful ToolsData
Format JSON
Format, validate and minify JSON in one click.
Everything runs in your browser. No file is ever uploaded to a server.
How to use it
- 1Paste or type your JSON into the box.
- 2Click 'Format (2 spaces)' to pretty-print it, or 'Minify' to collapse it to one line.
- 3If it's invalid, read the error message and fix the spot it points to.
- 4Click Copy to grab the result.
Frequently asked questions
What happens if my JSON has a syntax error?+
The tool shows the exact parser error message inline (like where the unexpected character is) without wiping out what you typed, so you can find and fix the problem in place.
Does formatting also validate my JSON?+
Yes, both Format and Minify parse the text first. If it fails to parse you get an error and nothing changes; if either button succeeds, that's your confirmation the JSON is syntactically valid.
Is there a size limit on the JSON I can paste in?+
No server-side limit: it all runs in your browser, so the practical ceiling is how much your browser tab's memory and the textarea can comfortably handle, not any upload cap.