HMAC in client side JavaScript and identity spoofing -

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cryptojs has functions create hmac message , secret key.

how can secure considering secret key must stored in plain sight in javascript source deployed on client ?

anyone can take key , issue similar requests server under identity of original client of api. isn't "identity" problem hmac supposed solve ?

all in all, not understand purpose of hmac in client side js since key can't kept secret.

is there use case computing hmac in javascript ?

javascript has webrtc 2 clients can communicate peer-to-peer, scenario clients can generate , use own "secret".

there cases client -> server usable well. if server "dynamically" serving javascript insert "secret" based on clients current session/login. assuming using https (if not there man in middle slurping "secret") it's not unreasonable assume communication server signed specific "secret" (even on unsecured http) belongs client.


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