Best JSON Formatter

Browser extension

Make raw JSON responses readable automatically.

The Best JSON Formatter extension recognizes raw JSON tabs, formats them locally, and keeps Find, Copy, and the full web workspace one step away.

Download extensionOpen the formatter

What it does

  • Formats JSON responses without sending the document to a server.
  • Preserves duplicate keys, large integers, exponent notation, and escaped strings.
  • Shows Find with previous and next match controls by default.
  • Copies the formatted response or opens the advanced web workspace.

Install this packaged preview

  1. Download and extract the ZIP file.
  2. Open chrome://extensions in Chrome or another Chromium browser.
  3. Enable Developer mode, choose Load unpacked, and select the extracted folder.

Chrome Web Store installation will replace these preview steps after the listing completes its external account and review process.

Local processing and transparent site access

The extension has no analytics and no account. Its content script checks whether a tab contains a raw JSON response and otherwise does nothing. The current document remains within the tab and extension service worker; opening the web workspace does not transfer it.

Because a JSON response can come from any origin, Chromium describes this as access to all sites during installation. The script exits immediately unless the browser reports JSON or the page contains a single raw JSON block.

Review the complete privacy policy or test formatter correctness with the public fixtures.