JSON Formatter

Format, validate, and minify JSON online for free. Private in-browser JSON formatter — no signup or uploads.

About this tool

JSON Formatter pretty-prints, validates, and minifies JSON. Paste API responses or config files, fix errors quickly, and copy clean output — all offline in the browser.

How to use

  1. Paste JSON into the editor (or load from a file if available).
  2. Format to pretty-print, or minify for a compact payload.
  3. Fix any validation errors highlighted by the tool.
  4. Copy or download the result.

FAQ

Does it validate JSON?

Yes. Invalid JSON shows a clear error so you can fix commas, brackets, or quotes.

Can I minify as well as format?

Yes. Use minify when you need a smaller payload for APIs or storage.

Is my JSON sent to a server?

No. Formatting and validation run entirely in your browser.

What does JSON Formatter do?

JSON Formatter pretty-prints, validates, and minifies JSON.

How do I use JSON Formatter?

Open the JSON Formatter tool, then paste JSON into the editor (or load from a file if available).

Related tools