Pretty-print, minify and validate JSON with exact error positions. This free tool by electronmagazine.com runs entirely in your browser — no sign-up, no uploads, no tracking of your input.
How to use
- Paste your JSON into the input box.
- Click Format to pretty-print or Minify to compress.
- Read the status line for validation errors and their position.
- Copy the result with the Copy button.
FAQ
Does the JSON formatter upload my data?
No, parsing uses your browser's native JSON engine locally.
Why is my JSON invalid?
Common causes are trailing commas, single quotes, or unquoted keys.
Can it handle large files?
Yes, several megabytes format instantly in modern browsers.
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