JSON Formatter & Validator

This JSON formatter and validator beautifies messy or minified JSON into clean, indented output you can actually read - and flags invalid JSON with the exact line and column of the problem, so you can fix syntax errors fast. Choose 2 spaces, 4 spaces, or tabs, or minify JSON down to a single line for production.

Everything runs in your browser. Your data is never uploaded to a server, which makes it safe for API responses, config files, and anything sensitive. Paste a payload, click Format or Minify, and copy the result. Because it's fully client-side, the JSON formatter also keeps working offline once the page has loaded.