JSON Formatter & Validator

Paste JSON to instantly validate, pretty-print or minify it. Everything runs locally in your browser — nothing is uploaded or stored.

How to use this JSON formatter

Paste or type any JSON document into the input box above, then click Format / Beautify to get a clean, indented version, or Minify to strip whitespace for production use. If the JSON is invalid, the tool tells you exactly what went wrong so you can fix it quickly.

Why validate JSON?

Malformed JSON is one of the most common causes of broken API integrations and config files. A single missing comma or unescaped quote will cause JSON.parse to throw in almost every programming language. Validating and formatting your JSON before shipping it catches these mistakes early.