What is JWT?
Blog post from Postman
JSON Web Token (JWT) is an open standard used for securely transmitting JSON data between parties, primarily in API authentication and authorization workflows. It achieves data authenticity and integrity through encoding and digital signing, with its structure comprising a header, payload, and signature. JWTs can be signed using JSON Web Signature (JWS) or encrypted with JSON Web Encryption (JWE), depending on whether the focus is on authenticity or confidentiality. A key advantage of JWTs is that they allow for stateless authentication, meaning servers do not need to maintain session state for users, which is beneficial in distributed systems. JWTs are compact, interoperable across different platforms, and useful for cross-domain communication. However, they also present challenges such as potential security risks if not handled properly, the lack of a built-in invalidation mechanism, and the difficulty in securely storing them on the client side. Best practices when working with JWTs include keeping payloads small, validating and verifying tokens, using secure libraries, and implementing token expiry to enhance security.
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