# JWT Debugger

> The JWT.io debugger as a Web Extension

Canonical page: [https://chrome-stats.com/d/jwtio-debugger](https://chrome-stats.com/d/jwtio-debugger)

## Overview

- **ID:** `jwtio-debugger`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** JWT.io
- **Category:** web-development,other
- **Daily users:** 957
- **Weekly downloads:** 12
- **Rating:** 5.00 / 5 (5 ratings)
- **Version:** 3.2.0
- **Last updated:** 2020-03-16
- **First published:** 2018-02-28
- **Size:** 496 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/jwtio-debugger/)
- **Website:** [https://github.com/jsonwebtoken/jsonwebtoken.github.io](https://github.com/jsonwebtoken/jsonwebtoken.github.io)

## Description

**JWT Debugger** is a powerful browser extension based on the popular [JWT.io](http://JWT.io) debugger. Designed to streamline your workflow, it allows you to debug JSON Web Tokens directly within your browser without opening external sites or consoles.

This extension offers extensive support for multiple signature algorithms including HS256/384/512, RS256/384/512, PS256/384, and ES256/384. You can easily edit all JWTs from the current tab, whether stored in cookies or web storage, and get shareable URLs for quick communication. Features such as claim tooltips, human-readable timestamp tooltips, and automatic public-key downloads enhance usability and performance. JWT Debugger is open source and maintained by Auth0, ensuring reliable and up-to-date JWT debugging capabilities directly in your browser.

## Rankings

- #3,362 — Overall
- #372 — Web Development
- #10 — debug
- #49 — algorithm
- #195 — console

## Permissions and access

### Permissions

- `activeTab`
- `<all_urls>`
- `cookies`
- `storage`
- `clipboardRead`
- `clipboardWrite`

### Content script matches

- `jwt.io`

## Safety

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

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- 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).

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Source: [Chrome-Stats](https://chrome-stats.com/d/jwtio-debugger)