npm install Does Far More Than Download Files, Developers Should Know Why

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Running npm install triggers a multi-step process that includes dependency resolution, lockfile processing, native builds, and potentially executing lifecycle scripts — not just downloading files. A single package installation can silently pull in dozens or hundreds of transitive dependencies that developers may never directly inspect. Packages can define postinstall scripts in their package.json, meaning code from your dependency chain can run automatically during installation. While lifecycle scripts are a legitimate npm feature used by many trusted packages, they represent a real security consideration in software supply chains. Understanding what npm install actually does helps developers make more informed decisions about the packages they trust and install.

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