Item logo image for JSON Formatter Classic

JSON Formatter Classic

callumlocke.com
5.0(

1 rating

)
Item media 2 (screenshot) for JSON Formatter Classic
Item media 1 (screenshot) for JSON Formatter Classic
Item media 2 (screenshot) for JSON Formatter Classic
Item media 1 (screenshot) for JSON Formatter Classic
Item media 1 (screenshot) for JSON Formatter Classic
Item media 2 (screenshot) for JSON Formatter Classic

Overview

Makes JSON easy to read

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 šŸŽļø **Fast** — even on very long JSON pages šŸŒ— Dark mode support šŸŽØ Syntax highlighting šŸ“Ž Code folding and indent guides šŸ”— Clickable URLs šŸ”Œ Raw/Parsed toggler Pro tips: šŸŖ„ Hold down Ctrl (or ⌘ on Mac) when clicking to fold/unfold all adjacent siblings šŸŖ„ 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

Details

  • Version
    0.8.1
  • Updated
    January 12, 2026
  • Size
    20.73KiB
  • Languages
    English (United Kingdom)
  • Developer
    Callum Locke
    36 Addington Grove London SE26 4JX GB
    Website
    Email
    callum.locke@gmail.com
  • Non-trader
    This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

Manage extensions and learn how they're being used in your organization
The developer has disclosed that it will not collect or use your data.

This developer declares that your data is

  • 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

Support

Related

Clear Cache

4.5

Powerful, user-friendly browser data management, right from your toolbar.

SEO META in 1 CLICK

4.9

Displays all meta data and main SEO information for the best SEO

Stylus

4.5

Redesign the web with Stylus, a user styles manager. Stylus allows you to easily install themes and skins for many popular sites.

ColorPick Eyedropper

4.2

A zoomed eyedropper & color chooser tool that allows you to select color values from webpages and more.

ColorZilla

4.6

Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies

Tag Assistant

3.9

The Tag Assistant extension works with Tag Assistant to help troubleshoot installation of gtag.js and Google Tag Manager.

User-Agent Switcher for Chrome

3.9

Spoofs & Mimics User-Agent strings.

Lighthouse

4.4

Lighthouse is an open-source, automated tool for improving the performance, quality, and correctness of your web apps.

Web Developer

4.5

Adds a toolbar button with various web developer tools.

Similarweb - Website Traffic & SEO Checker

4.7

Instant website analysis and SEO metrics at your fingertips.

Eye Dropper

4.3

Pick colors from any website.

SEOquake

4.5

SEOquake is a free plugin that provides you with key SEO metrics, along with other useful tools such as SEO Audit and many others

Clear Cache

4.5

Powerful, user-friendly browser data management, right from your toolbar.

SEO META in 1 CLICK

4.9

Displays all meta data and main SEO information for the best SEO

Stylus

4.5

Redesign the web with Stylus, a user styles manager. Stylus allows you to easily install themes and skins for many popular sites.

ColorPick Eyedropper

4.2

A zoomed eyedropper & color chooser tool that allows you to select color values from webpages and more.

ColorZilla

4.6

Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies

Tag Assistant

3.9

The Tag Assistant extension works with Tag Assistant to help troubleshoot installation of gtag.js and Google Tag Manager.

User-Agent Switcher for Chrome

3.9

Spoofs & Mimics User-Agent strings.

Lighthouse

4.4

Lighthouse is an open-source, automated tool for improving the performance, quality, and correctness of your web apps.

Google apps