How to trace enduser.id attribute in JWT token?

[sytdas]

Hi, is there any extensions for tracing enduser.id from a JWT token? I am using express. I tried setting attribute to span but it does not change.

import Tracer from '@opentelemetry/api';
import semanticConventions from '@opentelemetry/semantic-conventions'

const { SemanticAttributes } = semanticConventions
export function traceUser(req, _res, next) {
const span = Tracer.trace.getActiveSpan();
  if (req.headers.authorization) {
    const [, payload] = req.headers.authorization.split('.');
    const { user_id } = JSON.parse(Buffer.from(payload, 'base64').toString());
    console.log(SemanticAttributes.ENDUSER_ID)
    span.setAttribute(SemanticAttributes.ENDUSER_ID, user_id)
  }

  next()
}

[Flarna]

I'm not aware of such a thing. But via your sample you implemented most of it already. Either create a child span showing the details you want or add an attribute to the current span if it fits better.

[sytdas]

Thanks @Flarna , I picked wrong field from payload so the value was undefined.