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How do I retrieve jwt on the server?
So I create jwt on the frontend for the user:
const promise = account.createJWT();
How do I retrieve it on the backend?
TypeScript
client
.setEndpoint('https://cloud.appwrite.io/v1') // Your API Endpoint
.setProject('[PROJECT_ID]') // Your project ID
.setJWT('eyJJ9.eyJ...886ca'); // Your secret JSON Web Token
TL;DR
The user wants to know how to retrieve a JWT on the server. The JWT can be obtained from the `APPWRITE_FUNCTION_JWT` variable. To retrieve the JWT on the backend, use the `setJWT` function and pass the JWT as a parameter. 
from client send it to server
is JWT attached to every req?
No
If a user is execution the function then any time is doing so a fresh JWT will be sent to you inside the APPWRITE_FUNCTION_JWT variable.
Like so
TypeScript
.setJWT(req.variables.APPWRITE_FUNCTION_JWT ?? '')
Check here for more details: https://appwrite.io/docs/functions#functionVariables
