Dockerizing a Node.js App in 2026: The Practical Guide Not another "what is Docker" post. This is the exact setup I use for every production Node.js service. The Goal Take a typical Node.js app and make it: Reproducible — same environment everywhere Portable — runs on any cloud provider Efficient — small images, fast builds Production-ready — health checks, logging, security Starting Point // server.js const express = require ( ' express ' ); const app = express (); app . get ( ' /health ' , ( req , res ) => res . json ({ status : ' ok ' , time : Date . now () })); app . get ( ' /api/hello ' , ( req , res ) => res . json ({ message : ' Hello World ' })); const PORT = process . env . PORT || 3000 ; app . listen ( PORT , () => console .…