Json Formatter Chrome extension icon

Json Formatter

👥 2M+ users
📦 v0.10.2
💾 20.35KiB
📅 2026-05-16
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Overview

The original JSON Formatter, now with optional dark mode 🌚

Auto-formats JSON when you load it in a browser tab.

FEATURES

- Fast, even on very long JSON pages
- Dark mode
- Syntax highlighting
- Collapsible trees, with indent guides
- Clickable URLs
- Negligible performance impact on non-JSON pages (less than 1 millisecond)
- Works on any valid JSON page – URL doesn't matter
- Buttons for toggling between raw and parsed JSON
- FIXED: Exports the parsed JSON to window.json so you can explore it in Dev Tools

Note: this extension might clash with other browser extensions that modify the DOM before it runs. If it doesn't seem to be working, try disabling other extensions. If it clashes with an extension you need, open an issue and I'll try to find a solution.

SOME EXAMPLE JSON PAGES to try it out on:
https://callumlocke.github.io/json-formatter/

PRO TIP
Hold down control (or cmd on Mac) while collapsing a tree - collapses all siblings too.

PRIVACY
No tracking, no advertising, and nothing else nefarious.

SOURCE CODE
github.com/callumlocke/json-formatter

ISSUES
github.com/callumlocke/json-formatter/issues

Tags

Productivity/developer developer productivity/developer

Privacy Practices

Not being sold to third parties, outside of the approved use cases
Not being used or transferred for purposes that are unrelated to the item's core functionality
Not being used or transferred to determine creditworthiness or for lending purposes

🔐 Security Analysis

⏳ Security scan is queued. Check back soon.

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