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I am trying to find information about this JavaScript/node.js function:

HMACSHA256()

Its mentioned e.g. here:

It's mentioned in other places too.

Neither node.js nor any browser JavaScript provides any function with that name.

So what is it? Is it pseudo code or is it a dummy function or simply a mistake everybody copies and pastes?

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It is a standard algorithum.

The JWT documentation is providing psuedo-code (and also links off to JWT specific libraries that you should probably be using instead of writing your own implementation).

The blog you've found has code examples using Crypto-JS

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Thanks for clarifying. I was confused because everything else e.g. in the blog article is concrete JS/node code.
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You need a plugin named "crypto" It has "createHmac" function where you can give "sha256" as an argument.

https://nodejs.org/api/crypto.html#cryptocreatehmacalgorithm-key-options

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