mcp-server-npm-plus

npm package research from your AI assistant. Search packages, check bundle sizes, scan for vulnerabilities, compare download counts, and inspect dependency trees. No API keys needed.

npx mcp-server-npm-plus

Works with Claude Desktop, Cursor, VS Code Copilot, and any MCP client. Uses public npm registry APIs.

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Why

Choosing between npm packages usually means opening a bunch of browser tabs: npm for package info, Bundlephobia for size, Snyk for vulnerabilities, npm trends for download comparisons. This server puts all of that in one place, accessible through your AI assistant. Ask "compare zustand vs jotai vs valtio" and get download numbers, bundle sizes, and dependency counts side by side. Ask "are there any known vulnerabilities in express?" and get the answer without leaving your editor. It uses only public npm APIs, so there's nothing to sign up for.

Tools

Tool	Description
search	Search npm packages by query
package_info	Get detailed info: description, license, repo, dependencies
downloads	Get download stats for a package
compare_downloads	Compare download counts across multiple packages
bundle_size	Get bundle size (minified + gzip) via Bundlephobia
vulnerabilities	Get vulnerability info and advisory links
dependency_tree	Show direct dependencies as a tree
download_trends	Daily breakdown with sparkline

Quick Start

Cursor

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "npm-plus": {
      "command": "npx",
      "args": ["mcp-server-npm-plus"]
    }
  }
}

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "npm-plus": {
      "command": "npx",
      "args": ["mcp-server-npm-plus"]
    }
  }
}

VS Code

Use the MCP extension and configure the server with npx mcp-server-npm-plus.

Example Prompts

• "Search npm for React state management libraries"
• "What's the bundle size of lodash?"
• "Compare downloads of zustand vs jotai vs valtio"
• "Check for vulnerabilities in express"
• "Show me the dependency tree for next"
• "What are the download trends for typescript this month?"

Development

npm install
npm run typecheck
npm run build
npm test
npm run lint
npm run format

See also

More MCP servers and developer tools on my portfolio.

Author

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License

MIT © 2026 Ofer Shapira