# JASON (JSON Manager)

> JASON (JSON Manager) is a local-first JSON workspace that lives in your browser sidebar and is built for developers, QA, API testers, and technical users who work with JSON all day.

Canonical page: [https://chrome-stats.com/d/jason-json-manager](https://chrome-stats.com/d/jason-json-manager)

## Overview

- **ID:** `jason-json-manager`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** StefanoStem
- **Category:** web-development,tabs
- **Daily users:** 1
- **Version:** 1.2.0
- **Last updated:** 2026-04-12
- **First published:** 2026-02-16
- **Size:** 61 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/jason-json-manager/)
- **Website:** [https://github.com/StefanoStem/JASON-JSON-Manager](https://github.com/StefanoStem/JASON-JSON-Manager)

## Description

<strong>What is it</strong>
A focused side-panel tool for:
- Collecting JSON-like payloads from active pages,
- Storing and organizing snippets in tabs,
- Validating/formatting/minifying content,
- Comparing two payloads with visual diff guidance.

<strong>How you use it</strong>
Three core modes:
- Store: 
   - tabbed JSON workspace (edit, search, fold, format, save, download).
- Compare: 
   - two JSON fields side by side, run comparison, inspect line/word-level diffs, and confirm perfect matches.
- Capture: 
   - run scan on current tab, review results, store or compare selected captures.

<strong>Why</strong>
- Reduces context switching between devtools, editors, and scratchpads.
- Keeps JSON workflows in one persistent place.
- Improves review speed with inline compare visuals and searchable content.

<strong>UI/UX</strong>
- Local persistence with fast reopen behavior.
- Light/dark theme support.
- Real-time size/validation feedback.
- Search across workspace content and capture content.
- Scan flow includes user feedback and retry behavior for common tab-readiness timing cases.

<strong>Privacy and architecture</strong>
- No analytics, no third-party telemetry, no external data transmission.
- Data stays in browser local storage.
- Plain JS architecture with shared source + browser-specific manifests/background scripts.
- Deterministic build pipeline with manifest sync checks.

## Rankings

- #125,286 — Overall
- #71 — json
- #201 — ux

## Permissions and access

### Permissions

- `storage`
- `tabs`
- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [JSON Editor](https://chrome-stats.com/d/browser-json-editor) — 22 users, 2.00 / 5
- [jsonyo · JSON Swiss-Army Knife](https://chrome-stats.com/d/jsonyo-json-swiss-army-knife) — 3 users
- [JSON Viewer](https://chrome-stats.com/d/dan3988-json-viewer) — 44 users, 3.00 / 5
- [JSON Viewer Pro By PatilWeb](https://chrome-stats.com/d/json-viewer-pro-by-patilweb) — 11 users, 2.00 / 5
- [Free JSON Formatter](https://chrome-stats.com/d/free-json-formatter)
- [JSON Viewer+](https://chrome-stats.com/d/json-viewer-plus) — 1 users
- [StructFlow](https://chrome-stats.com/d/structflow) — 1 users
- [JSON Formatter](https://chrome-stats.com/d/json-formatter-sidebar) — 4 users
- [JSON Bonsai](https://chrome-stats.com/d/json-bonsai) — 3 users
- [JSON-Tool](https://chrome-stats.com/d/json-tool) — 2 users
- [Styled JSON Viewer](https://chrome-stats.com/d/styled-json-viewer) — 2 users
- [JSON\[B\] Viewer](https://chrome-stats.com/d/jsonb) — 11 users, 4.00 / 5

---

Source: [Chrome-Stats](https://chrome-stats.com/d/jason-json-manager)