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JSON Formatter

Format, minify and validate JSON with clear error messages.

About the JSON Formatter

The JSON Formatter pretty-prints messy JSON with clean indentation, minifies it back to one line for production, and validates it as you go. When the JSON is invalid, the error message points to the problem instead of failing silently — the fastest way to debug API responses, config files and data exports.

How to use it

  1. Paste your JSON into the box.
  2. Press Format to beautify it, or Minify to compress it.
  3. If it is invalid, read the error message to find and fix the problem.
  4. Copy the result.

Frequently asked questions

What makes JSON invalid?

The usual causes are trailing commas, single quotes instead of double quotes, unquoted keys, and missing commas or brackets. The validator's message tells you where the parser stopped.

Is my JSON uploaded to a server?

No. Formatting and validation happen in your browser with JavaScript, so API keys, tokens and private data in your JSON never leave your device.

What is the difference between formatting and minifying?

Formatting adds indentation and line breaks so humans can read the structure. Minifying removes all unnecessary whitespace so the JSON is as small as possible for sending or storing.

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