Minimal example of how to use zipkin

index.js

const express = require('express');
const { BatchRecorder, Tracer, Annotation, ExplicitContext } = require('zipkin');
const { HttpLogger } = require('zipkin-transport-http');

const tracer = new Tracer({
    ctxImpl: new ExplicitContext(),
    recorder: new BatchRecorder({
        logger: new HttpLogger({
            endpoint: 'http://localhost:9411/api/v1/spans',
        }),
    }),
});

const app = express();

app.use(function zipkinExpressMiddleware(req, res, next) {
    tracer.scoped(() => {
        tracer.setId(tracer.createRootId());
        const id = tracer.id;

        tracer.recordServiceName('FOO');

        setTimeout(() => {
            tracer.scoped(() => {
                tracer.setId(id);
                tracer.recordAnnotation(new Annotation.ServerSend());
            });
        }, 100);

        next();
    });
});

app.get('/', (req, res) => {
    res.send(Date.now().toString());
});

app.listen(8081, () => {
    console.log('Frontend listening on port 8081!');
});

package.json

{
  "scripts": {
    "start": "node index.js",
    "startZipkin": "docker run -d -p 9411:9411 openzipkin/zipkin"
  },
  "dependencies": {
    "express": "^4.14.0",
    "zipkin": "^0.6.1",
    "zipkin-context-cls": "^0.6.1",
    "zipkin-transport-http": "^0.6.1"
  }
}