How to Add Distributed Tracing to a Node.js App Using OpenTelemetry

OpenTelemetry (OTel) is a vendor-neutral standard for generating telemetry signals — traces, metrics, and logs — that can be shipped via the OTLP wire format to any compatible backend. Developers can instrument a Node.js service with distributed tracing in a single afternoon by installing the OTel SDK and auto-instrumentations package, then launching the app with a single --require flag and a few environment variables. The auto-instrumentation library automatically patches popular libraries such as Express, PostgreSQL, Redis, and gRPC clients to emit spans without any manual code changes. Experts recommend starting with zero-code auto-instrumentation before writing custom spans, as hand-crafting spans for already-covered libraries is a common time sink for teams new to OTel. For production use, an explicit setup file is advised over the register-flag approach to give developers finer control over exporters, resource attributes, and which instrumentations are loaded.