Free JWT Encoder Decoder Tool
Enter a secret key (minimum 32 characters for security)
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About JWT Encoder Decoder
JSON Web Token (JWT) is a compact, URL-safe means of representing claims between two parties. Our JWT Encoder Decoder tool allows you to easily create, decode, and verify JWT tokens for authentication and information exchange in web applications.
What is JWT?
JWT is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. JWTs are commonly used for authentication and authorization in modern web applications.
JWT Structure
Header
Contains metadata about the token type and signing algorithm
Payload
Contains the claims (statements about an entity and additional data)
Signature
Used to verify that the sender is who it says it is
Key Features
Support for multiple algorithms (HS256, HS384, HS512, RS256, etc.)
Encode custom payloads into JWT tokens
Decode existing JWT tokens to view header and payload
Verify token signatures with secret keys
Handle token expiration validation
Copy generated tokens easily
Common Use Cases
User authentication and session management
API authorization and access control
Secure information exchange between services
Single Sign-On (SSO) implementations
Mobile app authentication
How to Use
Encoding a JWT Token
Select the signing algorithm
Enter your payload data in JSON format
Provide a secret key for signing
Click "Generate JWT" to create the token
Decoding a JWT Token
Paste the JWT token you want to decode
Optionally provide the secret key for verification
Click "Decode JWT" to view the header and payload