JSON validator and formatter

Validate, format or minify JSON. Everything runs in your browser; nothing you paste is sent anywhere.

What counts as valid JSON

• Keys and strings use double quotes; single quotes are not JSON.
• No trailing comma after the last item of an object or array.
• No comments. A configuration file with comments is JSON5 or JSONC, not JSON.
• Numbers have no leading zeros and no hexadecimal form; NaN and Infinity are not allowed.