Free JWT Encoder Decoder Tool

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:

1. Select the signing algorithm
2. Enter your payload data in JSON format
3. Provide a secret key for signing
4. Click "Generate JWT" to create the token

Decoding:

1. Paste the JWT token you want to decode
2. Optionally provide the secret key for verification
3. Click "Decode JWT" to view the header and payload