JSON Formatter & Validator

The JSON Formatter beautifies messy or minified JSON with clean, consistent indentation, can minify it again, sort keys alphabetically, and validate the structure while highlighting any syntax errors. A tree view and query helpers make it easy to explore and navigate large documents instead of scrolling through an unbroken wall of text.

Developers use it constantly to make an API response readable, to catch a stray comma or an unbalanced bracket, and to tidy configuration files before committing them. Pinpointing the exact location of a syntax error turns what could be a frustrating, line-by-line hunt into a fix that takes a single second.

All formatting and validation run in your browser, so the JSON you paste — which often contains real request and response payloads — is never uploaded to a server. There is no install and no account, which keeps the workflow fast and your data private during everyday debugging.