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JSON formatter and validator

Paste JSON to pretty-print it, minify it, or see exactly why it is not valid. Nothing is sent anywhere.

Private by design: this tool runs in your browser. Nothing you add is uploaded.

How to use it

  1. Paste JSON into the box.
  2. Press "Format" to indent it, or "Minify" to pack it.
  3. If it is invalid, the message says what the parser found.
Screenshot of the JSON formatter tool on Sureno, in use
JSON formatter in use: a real screenshot of this page.

Questions and answers

Does it change the data?

No. Format and minify only change spacing. The values stay the same.

Is my JSON uploaded?

No. It is checked in this page.

What does "minify" do?

It removes the spaces and line breaks, making the JSON as small as possible for sending.

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