“dependencies”: {

"module-name": "0.1.0"
}

• exact: 0.1.0 will install that specific version of the module.
• newest minor version: ^0.1.0 will install the newest minor version, for example 0.2.0, but won’t install a module with a higher major version e.g. 1.0.0
• newest patch: 0.1.x or ~0.1.0 will install the newest patch version available, for example 0.1.4, but won’t install a module with higher major or minor version, e.g. 0.2.0 or 1.0.0.
• wildcard: \* will install the latest version of the module.
• git repository: the following will install a tarball from the master branch of a git repo. A #sha, #tag or #branch can also be provided:
• GitHub: user/project or user/project#v1.0.0
• url: git://gitlab.com/user/project.git or git://gitlab.com/user/project.git#develop
• local path: file:../lib/project

After adding them to your package.json, use the command npm install in your project directory in terminal.

devDependencies

"devDependencies": {
    "module-name": "0.1.0"
}

For dependencies required only for development, like testing styling proxies ext. Those dev-dependencies won’t be installed when running “npm install” in production mode.