Fast JSON viewer - highlights, shows items count/size, handles large files

JSON Lite: Fast and Efficient JSON Viewer Add-on for Firefox
JSON Lite is a user-friendly Firefox add-on designed for handling JSON/JSONP easily. It can outline arrays, objects, long values and also helps in encoding and decoding. JSON Lite is capable of showing large (10MB+) and even invalid JSON files. It provides the feature to count items and properties in the collection and displays their sizes. It also retains the original sequence of numeric keys, avoiding rounding off large numbers. Additionally, the 'Save as' feature enables saving the original JSON document.
Add-on stats
By: Lauri Rooden
Rating: 4.50
(103)
Weekly download count: 185
Firefox on Android: Yes
Manifest version: 2
Permissions:
- contextMenus
- storage
- tabs
- webRequest
- webRequestBlocking
- <all_urls>
Size: 27.98K
URLs: Website
Ranking
# 676 ▼ 6
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Add-on summary
Disable Firefox built-in JSON viewer first - go to about:config page and set 'devtools.jsonview.enabled' to false
Features:
- Format JSON/JSONP responses and clipboard
- Select and format/encode/decode text on every page
- Collapsible arrays, objects and long values
- Collapse all childs with Ctrl(Command) + Click
- Collapse property also on all sibling items with Alt(Option) + Click
- Count items and properties in a collection
- Show collection sizes
- Do its best to show large (10MB+) JSON files
- Do its best to show invalid JSON files
- Do not sort objects with numeric keys
- Do not round large numbers
User reviews
Pros
- Works well and looks nice
- Good formatting for viewing JSON
Cons
- Formatting issues with large JSON files
- Lack of support for dark mode
Most mentioned
- Good performance
- Request for dark mode support
User reviews
by georgewl, 2025-01-11
by Max, 2024-11-15
отлично!
by Firefox user 18461811, 2024-06-20
Add-on safety
Risk impact
JSON Lite requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.
Risk impact analysis details
- Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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Risk likelihood
We don't have sufficient data to confidently determine the risk likelihood of JSON Lite. Use it at your own risk.
Risk likelihood analysis details
- High This extension has low user count. Unpopular extensions may not be stable or safe.
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