JWT Decoder Tool (No Signature Validation)
Header:
Payload:
JWT Decoder Tool – Decode JSON Web Tokens Instantly
Looking for a fast and secure way to decode your JWT tokens? Our JWT Decoder Tool allows you to easily inspect the header and payload of any JWT (JSON Web Token) — all from your browser, with no server processing and no data storage.
🔍 What is a JWT?
JWT (JSON Web Token) is a compact, URL-safe token format used for authentication and authorization in modern applications. A standard JWT consists of three parts:
- Header: Token type & algorithm
- Payload: Claims such as user ID, expiration time, etc.
- Signature: Used to verify token integrity
⚠️ This tool does not validate the token signature — it is intended for inspection and learning purposes only.
✅ Key Features:
- 🔐 100% Client-side — Your JWT never leaves your browser
- 📜 View decoded Header and Payload
- 🧾 Easy to use – Just paste and decode
- ⚡ Works with Auth0, Firebase, AWS Cognito, and more
- 🖥️ Fully responsive and mobile-friendly
🚀 How to Use the JWT Decoder Tool
- Paste your JWT into the input field
- Click Decode JWT
- View the Header and Payload instantly
It’s that simple!
❓ Frequently Asked Questions (FAQ)
Q: Is this tool secure to use?
A: Yes! This tool is 100% client-side. Your JWT is never sent to any server and remains private.
Q: Does it verify the signature?
A: No, this tool does not validate the signature. It only decodes the header and payload for review.
Q: Can I decode expired tokens?
A: Yes, the tool can decode any JWT, including expired tokens, since it doesn’t validate expiration.
Q: What are some common use cases?
- Debugging JWTs in dev environments
- Learning how JWTs are structured
- Extracting claims like user ID, email, or roles
📌 Use Cases
- API developers debugging JWT headers and payloads
- Security auditors reviewing token contents
- Students learning about JSON Web Tokens
Try the free JWT Decoder now and explore your tokens securely!