Express Trace Context

W3C Trace Context handling for express.js, based on traceheader and tracestate.

Can be easily integrated with loggers:

• Call .use(traceMiddleware) in server setup.
• Call getTraceContext() in your logging method.

Usage

npm i express-trace-context

See example at example/example.ts

Example

Console 1:

cd example

npm install

npx ts-node example.ts

Server started on port 3000

Console 2:

curl -s http://localhost:3000 -H 'traceparent: 00-11223344556677889900aabbccddeeff-1234567890abcdef-01' -H 'tracestate: congo=ucfJifl5GOE,rojo=00f067aa0ba902b7' -H 'Content-Type: application/json' -d '{ "some": "json body" }' | jq .

{
  "traceContext": {
... (details from request propagated here) ...

Also note logs in Console 1.

Develop

npm run clean

npm install

npm run lint

npm run test

npm run build

npm push

References

• https://www.w3.org/TR/trace-context/
• https://w3c.github.io/trace-context/
• https://nodejs.org/api/async_context.html
• https://www.udemy.com/course/understanding-typescript/learn/lecture/17751414

TODOs

• Implement remaining of specification details once stable