The package.json file is a package descriptor; it is used to store all metadata about the module, such as name, version, description, author, repository, and more. It's the single file required to effectively use npm, therefore, the package.json file can also be thought of as the "npm file". As the file extension would suggest, it must be in the JavaScript Object Notation (JSON) data format. If the JSON syntax is invalid, npm will display an error when reading this file. Using a package.json file in our project has many benefits. These include: making it easy to reinstall our dependencies by defining a dependencies field; letting...