What is HS256 JWT Token
HS256 (HMAC with SHA-256) is a signing algorithm used to create JSON Web Tokens (JWT). This security protocol combines three components: header, payload, and signature to authenticate users between services. The HS256 algorithm uses a shared secret key to sign tokens, making them ideal for stateless authentication systems.
HS256 JWT Token Structure
A HS256 JWT token contains three parts:
- **Header**: Declares the signing algorithm (HS256) and token type
- **Payload**: Contains claims like user ID, permissions, and expiration time
- **Signature**: Verifies the token's authenticity using the shared secret key
Example structure:
`header.payload.signature` where each part is Base64Url encoded. The signature is created by combining the encoded header, payload, and shared secret key through HMACSHA256.
Creating an HS256 JWT Token
Follow these steps to generate a token:
1. Define the header: `{"alg": "HS256\