JSON Formatter Classic

by Callum Locke · callumlocke.com · Developer Tools

Established publisherManifest V3 Free

View in Chrome Web Store Data as of 15 Oct 2026

Makes JSON easy to read

Users

1,000

0 in 30 days

Rating

5.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#31K

#26K among extensions

Version

0.8.1

updated 12 Jan 2026

Users

monthly, 3 months

Latest, 15 Oct 2026: 1,000 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 months

Latest, 15 Oct 2026: 1 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About JSON Formatter Classic

Automatically prettifies any JSON URL opened in a browser tab. NOTE: JSON Formatter Classic is built from the v0.8 branch (available on GitHub). I'm publishing it as an alternative for those who aren't interested in the new features I'm planning for JSON Formatter in 2026. This won't receive any further updates other than bugfixes. ______________________ FEATURES 🏎️ **Fast** — even on very long JSON pages 🌗 Dark mode support 🎨 Syntax highlighting 📎 Code folding and indent guides 🔗 Clickable URLs 🔌 Raw/Parsed toggler Pro tips: 🪄 Hold down Ctrl (or ⌘ on Mac) when clicking to fold/unfold all adjacent siblings 🪄 Open the Dev Tools console and type `json` if you want to explore the parsed JSON ______________________ SOURCE CODE: https://github.com/callumlocke/json-formatter FOLLOW ME: https://x.com/callumlocke