JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload, and signature.
How to use
- Paste your JWT token in the input area
- Click "Decode JWT" button
- View the decoded header, payload, and signature
- Copy any section using the copy button
Supports HS256, RS256, and other common JWT algorithms
What is JWT?
JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. It's commonly used for authentication and information exchange in web applications.
Structure
A JWT consists of three parts: Header (algorithm), Payload (claims), and Signature. Each part is Base64URL encoded and separated by dots.
Format
header.payload.signatureCommon Use Cases
Authentication
User login and session management
API Authorization
Secure API access with bearer tokens
Single Sign-On
SSO across multiple domains
Mobile Apps
Stateless authentication for mobile
Information Exchange
Secure data transfer between services
Microservices
Service-to-service authentication