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Creating a package.json file | npm Docs

You can add a package.json file to your package to make it easy for others to manage and install. Packages published to the registry must contain a package.json file.

A package.json file:

• lists the packages your project depends on
• specifies versions of a package that your project can use using semantic versioning rules
• makes your build reproducible, and therefore easier to share with other developers

Note: To make your package easier to find on the npm website, we recommend including a custom description in your package.json file.

A package.json file must contain "name" and "version" fields.

The "name" field contains your package's name and must be lowercase without any spaces. May contain hyphens, dots, and underscores.

The "version" field must be in the form x.x.x and follow the semantic versioning guidelines.

If you want inclusive package author information, in the "author" field use the following format (email and website are both optional):

{
  "name": "my-awesome-package",
  "version": "1.0.0",
  "author": "Your Name <email@example.com> (https://example.com)"
}

You can create a package.json file by running a CLI questionnaire or creating a default package.json file.

To create a package.json file with values that you supply, use the npm init command.

1. On the command line, navigate to the root directory of your package.

   cd /path/to/package

2. Run the following command:

   npm init

3. Answer the questions in the command line questionnaire.

If you expect to create many package.json files, you can customize the questions asked and fields created during the init process so all the package.json files contain a standard set of information.

1. In your home directory, create a file called .npm-init.js.

2. To add custom questions, using a text editor, add questions with the prompt function:

   module.exports = prompt("what's your favorite flavor of ice cream, buddy?", "I LIKE THEM ALL");

3. To add custom fields, using a text editor, add desired fields to the .npm-init.js file:

   module.exports = {
     customField: 'Example custom field',
     otherCustomField: 'This example field is really cool'
   }

To learn more about creating advanced npm init customizations, see the init-package-json GitHub repository.

To create a default package.json using information extracted from the current directory, use the npm init command with the --yes or -y flag. For a list of default values, see "Default values extracted from the current directory".

1. On the command line, navigate to the root directory of your package.

   cd /path/to/package

2. Run the following command:

   npm init --yes

> npm init --yes
Wrote to /home/monatheoctocat/my_package/package.json:
{
  "name": "my_package",
  "description": "make your package easier to find on the npm website",
  "version": "1.0.0",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "https://github.com/monatheoctocat/my_package.git"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "bugs": {
    "url": "https://github.com/monatheoctocat/my_package/issues"
  },
  "homepage": "https://github.com/monatheoctocat/my_package"
}

• name: the current directory name
• version: always 1.0.0
• description: info about the package, or an empty string ""
• scripts: by default creates an empty test script
• keywords: empty
• author: empty
• license: ISC
• bugs: information from the current directory, if present
• homepage: information from the current directory, if present

You can set default config options for the npm init command. For example, to set the default author email, author name, and license, on the command line, run the following commands:

> npm set init-author-email "example-user@example.com"
> npm set init-author-name "example_user"
> npm set init-license "MIT"

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