Free · Online · No install · Private

JSON Formatter & Validator

Pretty-print, validate, and minify JSON documents instantly — all in your browser, with nothing uploaded.

Try the tool now

Paste JSON to format, validate, or minify it.

Paste any JSON object or array, or drag and drop a .json file below.

Drag & drop a JSON file here

or

Result

Your formatted JSON will appear here.

🔒 Everything happens locally in your browser. Your JSON never leaves your device.

How to use this JSON formatter and validator

  1. Paste or drop JSON

    Enter JSON text in the box, or drag and drop a .json file.

  2. Format, minify, or validate

    Choose Format to pretty-print, Minify to compress, or Validate to check it quickly.

  3. Copy or download

    Copy the result or download it as a file. Nothing is stored or sent anywhere.

Why use a browser-based JSON formatter and validator?

  • Private & secure. JSON is formatted and validated locally in your browser and never uploaded.
  • Three tools in one. Pretty-print, minify, and validate any JSON document instantly.
  • No install, no sign-up. A free online JSON formatter that runs instantly.
  • Offline ready. Works without an internet connection once loaded.
  • Fast and lightweight. Instant results with a clean, developer-friendly interface.
  • Free forever. No paywalls, no limits, no data caps.

Frequently asked questions

What does "pretty-print" mean?

Pretty-printing (or formatting) adds indentation and line breaks so nested JSON is easy to read and scan. It doesn't change the meaning of your data.

What is JSON minification?

Minification removes all unnecessary whitespace and line breaks, producing the smallest valid JSON. This is useful for saving bandwidth in APIs or config files.

Is my JSON private?

Yes. All formatting, minifying, and validation happens locally in your browser using JavaScript. Your data never leaves your device.

Can I format a JSON file?

Yes. Drag and drop a .json file into the tool, or choose one with the file picker, then format, minify, or validate it.

Legal: All processing is done locally in your browser. Read our Privacy Policy, Terms of Service, and Cookie Policy.