Can I check for scoped packages like @myorg/package?

Yes, the skill fully supports scoped packages. Simply provide the full name including the @ symbol and the scope prefix.

How does the npm-exists skill check for package existence?

It performs a HEAD request to the official npm registry API. A 200 OK response indicates the package exists, while a 404 Not Found status suggests the name is available.

What is the difference between npm-exists and npm-info?

The npm-exists skill is a lightweight check for presence/availability, whereas npm-info is intended for retrieving detailed metadata like versions, dependencies, and authors.

Is the information provided by the skill always up to date?

Results are cached for one hour to optimize performance. However, you can use the --no-cache option to fetch the most current data directly from the API.

Does it check for naming rule compliance?

Yes, the skill validates the package name against npm's official naming rules (e.g., URL-safe characters, length limits, and reserved names) before querying the registry.

NPM Package Existence

Name: NPM Package Existence
Author: Mearman

byMearman

•

생산성 및 워크플로

Verifies the availability and existence of package names within the npm registry to prevent naming conflicts and installation errors.

The npm-exists skill provides a specialized utility for developers to instantly verify whether a package name is currently registered on npm. By performing efficient HEAD requests to the npm registry, it helps users determine if a package name is available for a new project or if a dependency is correctly published. This tool is essential for avoiding naming collisions, validating scoped packages, and ensuring that installation commands will succeed before they are executed in a workflow.

주요 기능

01Built-in caching mechanism with a 1-hour freshness window

022 GitHub stars

03Support for both standard and scoped package names (@scope/name)

04Automatic validation against npm naming conventions and rules

05Direct CLI execution with optional cache bypass

06Instant npm registry verification via lightweight HEAD requests

사용 사례

01Checking name availability before publishing a new open-source package

02Verifying that a dependency is published and reachable before adding it to a project

03Validating the syntax and existence of organizational scoped packages

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add mearman/marketplace npm-exists

For use in Claude.ai and ChatGPT

Download Skill