Firefox Browser Add-ons
  • Extensions
  • Themes
    • for Firefox
    • Dictionaries & Language Packs
    • Other Browser Sites
    • Add-ons for Android
Log in
Preview of LuminaJSON - JSON Formatter

LuminaJSON - JSON Formatter by Furneez.com

The ultimate JSON Formatter & Viewer. Validate, Format, and Browse JSON with Dark Mode, Raw/Parsed views, and Developer Tools.

Available on Firefox for Android™Available on Firefox for Android™
0 (0 reviews)0 (0 reviews)
Download Firefox and get the extension
Download file

Extension Metadata

Screenshots
About this extension
Professional JSON Formatter & Viewer for Developers

When basic is not enough, we have the advanced JSON formatter for you.

Transform raw JSON data into a clean, readable, and interactive format instantly. This extension is designed for developers who need a fast, reliable, and feature-rich JSON tool directly in their browser.

Key Features:
  • Beautiful Formatting: Automatically formats JSON with syntax highlighting and perfect indentation.
  • Interactive Viewer: Collapsible trees and nodes make navigating large JSON files effortless.
  • Raw/Parsed View: Switch between raw and parsed views to see the JSON data in its original or formatted form.
  • Clickable URLs: Click on URLs to open them in a new tab.
  • Syntax Highlighting: Syntax highlighting makes reading JSON data easier.
  • Dark & Light Mode: Switch between a sleek Dark Mode and a clean Light Mode to suit your preference.
  • Advanced Tools:
    • Real-time Search: Filter and find specific keys or values instantly.
    • Base64 Decoding: Decode Base64 strings directly within the viewer.
    • JWT Decoder: Inspect JSON Web Tokens without leaving the page.
    • Timestamp Converter: Convert Unix timestamps to human-readable dates.
    • Diff Tool: Compare JSON objects side-by-side.
    • Copy as TypeScript: Generate TypeScript interfaces from your JSON automatically.
  • Privacy First: All processing happens locally in your browser. No data is ever sent to any server.
  • Performance: Handles large JSON files with ease.

Why choose this JSON Formatter?

Unlike other formatters, we prioritize both aesthetics and functionality. Whether you are debugging an API, inspecting a config file, or just need to read some data, this tool provides the best experience with zero configuration required.

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.

🤝 Transparency & Monetization

To keep LuminaJSON - JSON Formatter free for everyone, we may display relevant, high-quality recommendations in a clearly marked "Sponsored/Ads" section within the sidebar. These may include links to trusted services like Amazon, NordVPN, or Hostinger, etc. or other useful extensions.

Affiliate Disclosure: If you choose to purchase a service through these links, we may earn a small commission at no extra cost to you. This supports the ongoing development and maintenance of this project.

Interaction is entirely optional.

Keywords:
JSON Formatter, JSON Viewer, JSON Validator, JSON Pretty Print, JSON Beautifier, Developer Tools, Dark Mode, TypeScript Generator.
Rated 0 by 0 reviewers
Log in to rate this extension
There are no ratings yet

Star rating saved

5
0
4
0
3
0
2
0
1
0
No reviews yet
Permissions and data

Required permissions:

  • Access your data for all websites

Data collection:

  • The developer says this extension doesn't require data collection.
Learn more
More information
Add-on Links
  • Homepage
  • Support site
Version
1.2.0
Size
277.64 KB
Last updated
3 days ago (Feb 12, 2026)
Related Categories
  • Web Development
  • Privacy & Security
  • Appearance
License
All Rights Reserved
Version History
  • See all versions
Tags
  • anti tracker
  • dark mode
  • google
  • privacy
  • scholar
  • search
  • security
  • twitter
  • user scripts
  • vpn
Add to collection
Report this add-on
Go to Mozilla's homepage

Add-ons

  • About
  • Firefox Add-ons Blog
  • Extension Workshop
  • Developer Hub
  • Developer Policies
  • Community Blog
  • Forum
  • Report a bug
  • Review Guide

Browsers

  • Desktop
  • Mobile
  • Enterprise

Products

  • Browsers
  • VPN
  • Relay
  • Monitor
  • Pocket
  • Bluesky (@firefox.com)
  • Instagram (Firefox)
  • YouTube (firefoxchannel)
  • Privacy
  • Cookies
  • Legal

Except where otherwise noted, content on this site is licensed under the Creative Commons Attribution Share-Alike License v3.0 or any later version. Android is a trademark of Google LLC.