As mentioned above, the JWT is built following a standard structure (RFC 7519) and is composed of three essential parts: header, payload and signature. We will detail each of them below.
Header
The JWT header plays a crucial role as it contains relevant information about how a token is processed. It is composed of two parts:
Typ (type): Designates the type of token. For a JWT, the value of this key will be “JWT”.
Alg (Algorithm): This part specifies the japan cell phone number list signature algorithm used to encode the token. Various algorithms can be used, such as HMAC, SHA256, and RSA.
In addition, the JWT token payload is encrypted, ensuring data confidentiality and making it difficult for an attacker to modify the token or use a stolen one, as this would invalidate the signature.
json web tokens
Usability
JWT follows an open standard (RFC 7519) that defines a concise way to securely transmit information using a JSON object. This object can be transmitted across multiple platforms and programming languages.
As a result, JWTs can be used to authenticate requests on mobile devices, browsers, and desktops.