npm Registry MCP
About
Search packages, check versions, audit vulnerabilities and compare libraries directly from the npm registry (no API key required)
Details
- Author
- einfacheente
- Categories
- Developer Tools, Search, Knowledge Base
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Setup
Install npm Registry MCP in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/einfacheente/npm-Registry-MCP
Follow the installation instructions in the repository README, then restart your MCP client.
When you're coding with Claude and need to pick a package, check if something is still maintained, or audit a dependency for vulnerabilities — you normally have to stop, switch tabs, google it, and come back. This server removes that friction entirely. Claude can query the npm registry directly, in context, mid-conversation.
Once installed, just ask Claude naturally:
"What's the best package for parsing CSV files in Node?" "Is moment.js still actively maintained?" "Compare lodash and ramda" "Are there any known vulnerabilities in axios 0.21.1?" "What changed in express between v4 and v5?" "How many downloads does react get per month?" "Show me the README for the sharp package"
- macOS:~/Library/Application Support/Claude/claude_desktop_config.json
- Windows:%APPDATA%\Claude\claude_desktop_config.json
{ "mcpServers": { "npm-registry": { "command": "npx", "args": ["mcp-npm-registry"] } } }
That's it — no cloning, no building.npxhandles everything automatically.
Then usemcp-npm-registryas the command instead ofnpx mcp-npm-registry.
Fully quit and reopen Claude Desktop. You should see a tools icon confirming the server is connected.
No API key required — the npm registry is fully public.
# Run in dev mode (no build step needed) npm run dev # Build npm run build
The server communicates over stdio using the MCP protocol. You can test it directly:
echo '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}' | node dist/index.js
All data is fetched live from public APIs — no database, no cache, no rate limits on your end:
- registry.npmjs.org— package metadata and versions
- api.npmjs.org— download statistics
- api.npms.io— quality, maintenance and popularity scores
- registry.npmjs.org/-/npm/v1/security/advisories— vulnerability data
- get_changelog— diff between two versions
- Package README as an MCP resource
- Publish to npm for one-linenpxinstall
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