How JWT Token Blacklisting Works #systemdesign

JWT authentication is widely used in modern web applications because it is stateless and scalable. However, this creates a challenge when implementing logout functionality. Since the server does not store JWT tokens, a token remains valid until it expires even after a user logs out. This can create security risks if a token is reused or stolen.
Token blacklisting solves this problem by storing invalid tokens in a blacklist storage (usually Redis or database) and checking the blacklist before allowing any protected API request.
In this video you’ll learn how token blacklisting works, why JWT logout is tricky, and how backend systems prevent invalid tokens from accessing secure APIs.
This concept is important for developers building secure authentication systems, REST APIs, and scalable backend applications.
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Видео How JWT Token Blacklisting Works #systemdesign канала Genz Stack