Text & dev tools / JSON
JSON Formatter & Validator
without uploading it.
Pretty-print, validate, or minify JSON — instantly in your browser.
✓No upload✓No signup✓No watermark✓Free forever
Paste your JSON into the box.
Click "Format" to pretty-print or "Minify" to compress.
If the JSON is invalid, the error message tells you why.
Why there's no upload step
Malformed JSON is a common source of debugging headaches. This tool parses and re-serializes your JSON locally using the browser's native JSON parser, so you get instant, accurate error messages without sending any data to a server.
Questions
Is my JSON sent anywhere?+
No. Formatting and validation happen entirely in your browser.
What happens if my JSON is invalid?+
You'll see a clear error message describing what's wrong.