Print the local prefix to standard output. This is the closest parent directory to contain a package.json file or node_modules directory, unless -g is also specified.
If -g is specified, this will be the value of the global prefix. See npm help config for more detail.
npm prefix /usr/local/projects/foo
npm prefix -g /usr/local
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Operates in "global" mode, so that packages are installed into the prefix folder instead of the current working directory. See npm help folders for more on the differences in behavior.
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