JWT Explained: What It Is, How It Works, and Why You Should Care

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If you've ever built a login system and wondered "should I use sessions or tokens?" - this one's for you. So..What Even Is a JWT? JWT vs. Sessions — What's the Difference? Structure of a JWT A JWT looks like this: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VySWQiOiIxMjMiLCJleHAiOjE2OTAwMDB9.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c Scary at first, but it's just three Base64-encoded parts separated by dots: HEADER.PAYLOAD.SIGNATURE Header - tells you the algorithm used (e.g.

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