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> All the signature and encryption stuff in JWTs is complex. While common JWT libraries have now mostly got their stuff together, this has not always been the case.

This is a red herring. Applied cryptography was never considered an easy subject in software engineering circles. Neither was algorithms and data structures. Yet, it's still a basic tool, and developers are still expected to understand things such as why some maps allow reads in constant time while others require log time.

Some libraries being buggy never was an argument against using libraries. And do you expect your single-purpose code not to be?

I think we are seeing in this thread a knee-jerk reaction against perceived complexity. Yet, if you sit down and compare JWTs with alternatives and list all features along with pros and cons, you'd be hard-pressed to even try to put together a case for JWTs being bad.

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> Some libraries being buggy never was an argument against using libraries. And do you expect your single-purpose code not to be?

Of course you should use battle-tested and well-maintained libraries for the really hard stuff such as cryptography primitives. However, that is not the point I was trying to make.

My points here are:

1) If you can get away with not using cryptography for something, you probably should. Your web framework already supports session cookies. Even if it doesn't, it's very hard to mess up opaque tokens from SecureRandom or /dev/urandom and a corresponding database lookup.

2) If you actually need the things JWTs can do, the standard is still needlessly complex and easy to mess up in ways that are not inherent to the problems JWTs are trying to solve. I'm not saying this means you should roll your own solution (again, I agree that there is value in well-tested libraries), I'm further strengthening point 1) with this. Don't use JWTs if you don't need to