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All information you concern about JWT and step-by-step guide to verify JWT in diverse framework.
JWT (JSON Web Token) is a self-contained, stateless token that carries information in a structured and readable format. Whether you’re protecting an API or adopting token-based authentication for your application, JWTs are a powerful tool, because they:
A typical JWT is split into three parts, each encoded in Base64URL and separated by periods (.):
This structure enables JWTs to provide a compact, secure way of transmitting information between parties.
The claims are part of the payload and hold the key information. Here are standardized Registered Claims for your refer:
Claims | Full name | Description |
---|---|---|
iss | Issuer | The entity that issued the JWT, like the authorization server. |
sub | Subject | Identifies the JWT's subject, typically representing the authenticated user. |
aud | Audience | Specifies which recipients can accept and process the token. This can be an array of values for multiple audiences or a single value for a single recipient. |
exp | Expiration Time | Sets an expiration time on the token after which it becomes invalid. This helps prevent replay attacks by limiting how long a token remains valid. |
nbf | Not Before | Makes a token valid only after this timestamp. Helpful in situations where clocks are not accessible. |
iat | Issued At | When the token was created. This can be used to determine the token's age. |
jti | JWT ID | A unique identifier for the token, useful to prevent the same token from being used multiple times (e.g., in replay attacks). |
Depending on the specification and the configuration of the authorization server, additional claims may be included in the payload to support specific use cases. You can also add custom claims to JWT to meet unique business requirements.
Used in OpenID Connect, it includes claims like profile information (e.g., name, email, etc.) about the authenticated user.
Used in OAuth 2.0, it grants access to specific resources or APIs on behalf of the user or application.
JWTs can be particularly beneficial in the following scenarios:
The integrity of a JWT must be verified to ensure its header and payload have not been tampered with. Below are step-by-step examples for verifying JWTs in popular programming environments:
All information you concern about JWT and step-by-step guide to verify JWT in diverse framework.
Simplify your workflow and ensure secure user management with Logto Cloud. Built on OpenID Connect (OIDC), it leverages JWT to deliver a reliable authentication and authorization system designed to scale with your needs.