Checks if a given string is a valid npm package name adhering to npm rules and best practice

• Install
• Usage
• Error Strings
• Rule Exemption
• Contributors
• License

npm:

npm install is-valid-npm-name

yarn:

yarn add is-valid-npm-name

const isValidNpmName = require('is-valid-npm-name');

const check = isValidNpmName('fs');

// `check` is `true` or a String (e.g. why it was not a valid npm name)
if (check !== true) {
  console.error(check);
  // 'package name cannot use built-in core Node module name'
}

• package name must be a String
• remove trailing spaces from start and end of package name
• package name cannot be more than 214 characters
• package name cannot start with a dot nor underscore
• package name cannot have uppercase letters
• scoped package name must start with "@" character
• scoped package name has an extra "@" character
• scoped package name must be in the format of @myorg/package
• scoped package name has an extra "/" character
• package name cannot use built-in core Node module name
• package name had non-URL-safe characters

We ignore a single npm rule, which is:

don't put "js" or "node" in the name

This is due to the sheer number of npm package name squatters.

Sometimes it's absolutely necessary to affix with js or node.

MIT © Nick Baugh