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The package.json file is kind of manifest for your project. It is used to store the metadata related to the project as well as the list of dependency packages. It contains metadata such as a project description, the. version, description, license information, and many more things. The package.json file makes it easy for others to install and manage the packages related to. the project. If you want to store any dependency or any package related to your project then you need to create a package.