JSON Formatter & Validator

Paste JSON, get it pretty-printed and validated instantly — nothing leaves your browser

Have JSON you need in Excel?

This formatter is a pure front-end tool. For turning JSON into a real spreadsheet, use the free converter or the rate-limited developer API.

Convert JSON to Excel

How to Format JSON

  1. Paste your JSON. Any raw or minified JSON — object, array, or nested structure.
  2. Click Format & Validate. Valid JSON is pretty-printed with 2-space indentation. Invalid JSON shows exactly where the error is.
  3. Copy or download. Grab the formatted output directly, or save it as a .json file.

Everything happens locally in your browser — nothing you paste here is ever sent to a server.

Common Use Cases

  • Debugging an API response. Paste a minified response and instantly see its structure.
  • Fixing broken JSON. Get a precise line/column for a syntax error instead of guessing.
  • Sharing readable JSON. Pretty-print a config file before sharing it with a teammate.

Need to turn that JSON into a spreadsheet? Try the JSON to Excel converter, or check the FAQ.