is-valid-npm-name

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

Table of Contents

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

Install

npm:

npm install is-valid-npm-name

yarn:

yarn add is-valid-npm-name

Usage

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'
}

Error Strings

• 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

Rule Exemption

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.

Contributors

License

MIT © Nick Baugh