I found myself needing to encrypt a small string on Deno (and subsequently decrypt it later) for a small side project. I checked out a few websites with code samples. But those didn’t work/were out of date. So this is what worked for me:

Note: I am not a security expert and I don’t play one on TV. You shouldn’t trust anything important with random code you found on the internet. Seriously.

1. Save the key

First we generate a key using the standard SubtleCrypto api that ships with Deno. Then export a JSON webkey and save it. I’m putting it in an environmental variable. …