JSON Formatter
Beautify, minify, and validate JSON instantly
About JSON Formatter
Format, validate and minify JSON in your browser. Paste raw JSON from an API response or log file and get readable, indented output with errors pinpointed — or minify pretty JSON back into a compact single line for production. No data ever leaves your machine, so it is safe for API keys and customer payloads.
How to use the json formatter
- Paste your JSON into the editor.
- Click Format to pretty-print it, or Minify to compress it.
- Fix any syntax errors the validator highlights, then copy the result.
Frequently asked questions
Why is my JSON invalid?
The usual culprits: trailing commas, single quotes instead of double quotes, unquoted keys, or comments — none of which the JSON standard allows. The validator points to the exact position of the first error.
Is it safe to paste API responses with sensitive data?
Yes. Parsing and formatting run entirely in your browser; nothing is transmitted or logged.
What does minifying JSON do?
Minifying removes all whitespace and line breaks, shrinking the payload for faster network transfer. Functionality is identical — JSON ignores whitespace.