JSON Formatter + Validator

JSON Formatter & Validator Online

This free online JSON tool helps you format, validate, and minify JSON in seconds. It runs directly in your browser so your data stays private.

Why format JSON?

Pretty-printed JSON is easier to read, debug, and share. Formatting helps you spot missing commas, wrong brackets, or broken nesting.

Common JSON mistakes

• Trailing commas (example: {"a":1,})
• Using single quotes instead of double quotes
• Missing { } or [ ] brackets
• Unquoted object keys (example: {a: 1})

How to use this tool

Paste JSON into the editor above. Click Validate to check for errors, Format to pretty-print, or Minify to compress your JSON into one line.