JSON Formatter
Format, validate and minify JSON instantly, right in your browser.
🔒 Processed locally in your browser
Loading…
How to use
- Paste or type your JSON into the box above.
- Choose an indent size, then click Format to pretty-print it, or Minify to compact it onto one line.
- If the JSON is invalid, the exact line and column of the problem is shown.
- Use Copy to copy the result, or Download to save it as a .json file.
Features
- Pretty-print JSON with 2 spaces, 4 spaces, or tab indentation
- Minify JSON to a single compact line
- Clear error messages with line and column position
- 100% client-side — your data never leaves your browser
- Copy or download the formatted result
Frequently asked questions
Does my JSON get uploaded anywhere?
No. JSON Formatter runs entirely in your browser — your data is never sent to a server.
What happens if my JSON is invalid?
You'll see an error message that includes the exact line and column where parsing failed, making it easy to find and fix the problem.
Can I convert JSON back to a compact single line?
Yes, use the Minify button to remove all unnecessary whitespace and produce a compact single-line output.
Does it support very large JSON files?
Yes, though extremely large files (tens of megabytes) may be slow to process depending on your device, since everything happens in your browser.