Synopsis
npm prune [[<@scope>/]<pkg>...] [--production] [--dry-run] [--json]
Description
This command removes "extraneous" packages. If a package name is provided, then only packages matching one of the supplied names are removed.
Extraneous packages are those present in the node_modules folder that are not listed as any package's dependency list.
If the --production flag is specified or the NODE_ENV environment variable is set to production, this command will remove the packages specified in your devDependencies. Setting --no-production will negate NODE_ENV being set to production.
If the --dry-run flag is used then no changes will actually be made.
If the --json flag is used, then the changes npm prune made (or would have made with --dry-run) are printed as a JSON object.
In normal operation, extraneous modules are pruned automatically, so you'll only need this command with the --production flag. However, in the real world, operation is not always "normal". When crashes or mistakes happen, this command can help clean up any resulting garbage.
Summary
To remove extraneous packages (packages that are installed but not in dependency list) run the following command:
npm prune
To remove all dev packages add --production flag:
npm prune --production
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