How to Build Observability into Node.js Apps Using Prometheus and Grafana

A hands-on technical guide published on DEV Community explains how to implement observability in modern distributed software systems using open-source tools. The article covers the three core pillars of observability — logs, metrics, and traces — and distinguishes them from traditional monitoring approaches. It walks developers through setting up a Node.js API instrumented with the prom-client library to expose custom and default metrics. Prometheus is used to scrape and store these metrics in a time-series database, while Grafana visualises the data through interactive dashboards. The guide uses Docker and Docker Compose to wire up the full stack, making the setup reproducible and accessible for teams looking to improve production diagnostics without paid platforms.