JSON Formatter & Validator

Validate, pretty-print, and minify JSON entirely in your browser. No uploads, privacy-first.

JSON input

Result

How this JSON validator works

Paste JSON, click Validate & Pretty-print to lint and format, or Minify to shrink payloads. All parsing runs in-browser—no uploads—so it’s safe for private data. Great for fixing invalid JSON, checking API responses, and cleaning config files.

Keywords: json validator, json lint, fix invalid json, json formatter, pretty print json.