JSON Formatter & Validator
Beautify, minify and validate JSON instantly in your browser.
Formatted JSON will appear here.
Paste messy JSON to pretty-print it with proper indentation, or minify it to a single line. Invalid JSON gets a clear error message pointing at the problem. Parsing happens entirely in your browser, so your data stays private.
How to use the JSON Formatter
- Paste your JSON into the input box.
- Choose an indent size, then click Beautify or Minify.
- If the JSON is invalid, read the error message and fix the highlighted issue.
- Copy the formatted output.
Frequently asked questions
Is my JSON sent to a server?
No. Formatting and validation run locally using the browser's built-in JSON parser. Nothing is uploaded.
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 includes the position to help you locate it.
What is the difference between beautify and minify?
Beautify adds indentation and line breaks for readability; minify strips all unnecessary whitespace to make the JSON as small as possible for transport.