By default, npm installs the latest available version of modules according to each dependencies' semantic version. This can be problematic if a module author doesn't adhere to semver and introduces breaking changes in a module update, for example.

To lock down each dependencies' version (and the versions of their dependencies, etc) to the specific version installed locally in the node_modules folder, use

npm shrinkwrap

This will then create a npm-shrinkwrap.json alongside your package.json which lists the specific versions of dependencies

With all that being said, I highly recommend you keep learning!

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