JWT Decoder & Debugger: How JSON Web Tokens Work in 2026

JSON Web Tokens are in virtually every modern web application — but most developers who use them daily have never read the RFC. Understanding what the three parts actually contain, and why the signature matters, is the difference between secure auth and a textbook vulnerability.

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Originally published at https://wowhow.cloud/blogs/jwt-decoder-how-json-web-tokens-work-2026

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