Authentification with JWT token & Generate Tokens

Question

Hello,

i'v created a cockpit document, and i want to integrate it in a web page

i used the SDK with the 'Sbi.sdk.api.authenticate' js function it works correctly.

but my problem is, the user and password are showen to public with the methode, so that i want to implement the JWT Token Access.

if some one can helps me how to generate Token for knowage Users (inculding user and Password).

and how to implement it in my web page.

PS : i'v tried to use 'Sbi.sdk.api.authenticateByToken' function, but it dosen't work for me, i got this error 

"ERROR: Service [NaN"

Thanks.