But it is your program's responsibility to handle the lack of the dependency. The difference between devDependencies and dependencies is that the former contains development tools, like a testing library, while the latter is bundled with the app in production.Īs for the optionalDependencies the difference is that build failure of the dependency will not cause installation to fail. Shorthands of the flags can also be used: -no-optional will prevent optional dependencies from being installed.

-save-optional installs and adds the entry to the package.json file optionalDependencies.-no-save installs but does not add the entry to the package.json file dependencies.At the time this article was written, version 10.16.0-圆4 was the latest version. The precursor to npm was actually a bash utility named 'pm', which was the shortform name of 'pkgmakeinst' - a bash function. How to Install Node.js and NPM on Windows Step 1: Download Node.js Installer In a web browser, navigate to Click the Windows Installer button to download the latest default version. -save-dev installs and adds the entry to the package.json file devDependencies Contrary to popular belief, npm is not in fact an acronym for 'Node Package Manager' It is a recursive bacronymic abbreviation for 'npm is not an acronym' (if the project was named 'ninaa', then it would be an acronym).Often you'll see more flags added to this command: Before version 5, you needed to add the flag -save. Furthermore, since npm 5, this command adds to the package.json file dependencies.

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