DEVELOPER TOOLS · LOCAL ONLY
Format, validate, and minify JSON with clear error positions.
Up to 200,000 characters. Standard JSON only; input is never executed.
Run the tool to see the result
Up to 200,000 characters. Standard JSON only; input is never executed.
How to use
Paste JSON and choose Format to expand it with readable indentation, Minify to strip every space, or Validate to check only whether the document is legal JSON. When parsing fails the error position is shown, so a missing comma or quote is easy to find.
Limits and privacy
Everything runs inside this browser. Your input is never uploaded, stored, or written to the URL or any log.