# JWT Tool – Token Decoder — Decode, Build & Verify JWTs

> Decode, Build & Verify JWTs (iPhone/iPad app by 志鹏 潘.)

- Source: https://appshunter.io/ios/app/jwt-tool-token-decoder/id6758909057 (this page in markdown: same URL + `.md`)
- Developer: [志鹏 潘](https://appshunter.io/developer/1140381489)
- Category: Developer Tools, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 31 MB
- Languages: American English
- Released: 2026-02-10
- Data updated: 2026-08-07
- User reviews in markdown: https://appshunter.io/ios/app/jwt-tool-token-decoder/id6758909057/reviews.md

## What is JWT Tool?

JWT Tool — The Complete JWT Toolkit

A fast, privacy-first JWT toolkit for developers, security professionals, and learners.
Decode, build, and verify JSON Web Tokens — completely offline.

JWT Decoder
• Paste JWT or extract from clipboard instantly
• View decoded header, payload, and signature
• Real-time expiration countdown timer
• Verify signatures (HS256, RS256, ES256 and more)
• Automatic security vulnerability scanning
• Load example tokens to learn JWT structure

JWT Builder
• Create tokens with customizable claims
• Quick templates: Auth, ID, Refresh tokens
• Support for multiple algorithms (HMAC, RSA, ECDSA)
• Set expiration with quick buttons (+1h, +1d, +7d)
• Random secret key generator with strength indicator
• Real-time token preview with color-coded sections

JWT Learning Guide
• Structured tutorials from beginner to advanced
• Learn JWT basics, structure, and algorithms
• Interactive practice exercises
• Track your learning progress

Developer Tools
• Base64 Encoder/Decoder
• Unix Timestamp Converter
• Cryptographic Key Generator

Security Features
• Detect alg=none vulnerability
• Identify weak secrets and key confusion attacks
• Check missing expiration and required claims

Token History
• Save decoded and generated tokens
• Mark favorites for quick access
• Organize by date

Privacy First
• No account required
• No tracking or analytics
• Works fully offline
• All data stays on your device

Whether you're debugging authentication flows, building secure APIs, or learning JWT concepts, JWT Tool is your essential mobile companion.


## Version history (last 1 release)

### 1.0 — 2026-02-11

No release notes.

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All apps by 志鹏 潘: https://appshunter.io/developer/1140381489

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-07.*