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Free tools / JSON Formatter

Format & validate JSON

Paste JSON to beautify, minify or validate it. It runs entirely in your browser - nothing is uploaded - and points to the exact spot when the JSON is invalid.

JSON input
How it works
  1. 1Paste or type JSON into the box.
  2. 2Beautify to indent it readably, or Minify to strip whitespace for shipping.
  3. 3Invalid JSON shows the parser's error message so you can find the problem fast.
Frequently asked
Is my JSON uploaded anywhere?
No. Parsing and formatting happen entirely in your browser with the built-in JSON engine - nothing is sent to a server, so it's safe for sensitive payloads.
Why does it say my JSON is invalid?
Common causes are trailing commas, single quotes instead of double quotes, unquoted keys, or a stray comment - JSON allows none of those. The error message points at the position.
What's the difference between beautify and minify?
Beautify adds indentation and line breaks for readability; minify removes all optional whitespace to make the payload as small as possible for transport.
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