Developer
JSON Formatter
Prettify or minify JSON with instant validation and clear error messages — right in your browser.
How to use
- 1
Paste your JSON into the input box.
- 2
Click Prettify for readable, indented output, or Minify to compress it.
- 3
Check the error message if your JSON is invalid.
- 4
Copy the formatted result to your clipboard.
Features
- Prettify with 2-space indentation or minify to one line
- Clear, specific error messages for invalid JSON
- Handles deeply nested objects and arrays
- Runs entirely client-side — your data isn't uploaded
Frequently asked questions
Why does it say my JSON is invalid?
Common causes are trailing commas, single quotes instead of double quotes, or missing brackets — the error message points to what the parser found.
What's the difference between prettify and minify?
Prettify adds indentation and line breaks for readability; minify removes all unnecessary whitespace to produce the smallest possible output.
Is there a size limit?
No hard limit, though very large JSON files may take a moment longer to process.
Is my JSON data sent to a server?
No — formatting happens entirely in your browser.