security - Where are JWT tokens stored on the server and other related questions -

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as title suggests, jwt tokens stored on server side? in database or in memeory? understand implementation can vary due different requirements, in general store it?

if want provide basic token authentication server, meaning upon receiving username , password via post request, return token. in case, how token generated basic algorithm work differently jwt token?

with token generated simple algorithm:

  1. it not contain payload
  2. its value not computed based on username , password, cannot rehashed meaningful

in case, there still value use jwt?

thanks!


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