About JSON Formatter

Format, minify, validate, and repair JSON with a fast local-first workflow and optional AI assistance.

How it works

Paste or type JSON into the Monaco editor. The tool provides instant formatting and minification using deterministic local parsing. Validation highlights errors with line-level detail.

If your JSON is malformed, click AI Repair to let AI fix common issues like trailing commas, missing quotes, or truncated input. No AI runs unless you explicitly request it.

Key features

  • Local deterministic formatting and minification.
  • Validation with detailed error messages.
  • Optional AI repair for broken JSON.
  • Powered by the Monaco editor.