Multi-Stage Docker Builds for Python and Node.js

Sun, 25 May 2025 16:34:42 -0500

Multi-stage builds are easy to explain with Go, where the final stage holds one static binary. Python and Node.js are harder: the runtime needs an interpreter, a dependency tree, and sometimes native libraries, so you cannot just copy one file into scratch. This guide builds a real FastAPI service and a real Express service three ways, measures each image, and shows the stage layout that actually removes the weight.

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Multi-Stage Docker Builds for Python and Node.js