# The package.json file settings in JavaScript

When a programmer wants to make his library available to everyone, he must place it in the npm registry. To do this, he must format a `package.json` file of this library in a special way, adding some important settings.

These settings apply specifically to public libraries that you download from npm. In your projects for private use, you can choose not to install them.

So here is a list of the most popular settings:

Field | Description
--- | ---
`name` | project name, must be written in lower case
`version` | version number, according to semantic versioning
`description` | project description
`main` | primary entry point to project
`keywords` | this is an array to help find a module in the npm registry
`author` | this field accepts an object with the keys `name`, `email` and `url`, which makes it easy for people to contact the project author.
`license` | accepts a license name using the SPDX identifier. The default license is ISC, another popular choice is MIT. You can also use UNLICENSED for private and closed source projects.
`private` | if this key is set to true, the project will not be able to be public in the npm registry. This prevents accidental publication of the project.
`homepage` | Project home page URL
`bugs` | URL address where issues and bugs can be reported. Often this is the address of the project page on Github.

Install the jQuery library. Find a folder with the library in `node_modules` and then a `package.json` file in it. Study it.

Install the underscorejs library. Find the folder with the library in `node_modules` and then a `package.json` file in it. Study it.

Study the `package.json` file settings in official documentation.

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