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How to connect Npm to Claude

Connect Claude Web, Desktop and Cowork to Npm MCP. Search for the latest lodash release, list all dependencies for react project, and more using natural language, with authentication handled for you.

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Npm is the default package manager for JavaScript and Node.js projects. It streamlines dependency management and code sharing for developers.

12 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your Npm account to Claude via Composio Connect, enabling it to search for the latest lodash release, list all dependencies for react project, show weekly download stats for a package, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

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Connecting Npm to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your Npm account

Back in Claude, ask it to connect to Npm or give it any Npm-related task.

For example, ask Claude to:

  • "Search for the latest lodash release"
  • "List all dependencies for react project"
  • "Show weekly download stats for a package"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your Npm account is ready to use.

What is the Npm Claude Connector, and what's possible with it?

The Npm MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Npm account. It provides structured and secure access to your Npm ecosystem, so your agent can perform actions like searching for packages, retrieving metadata, managing dependencies, publishing new versions, and analyzing project stats on your behalf.

  • Package discovery and search: Instantly ask your agent to look up packages, find alternatives, or fetch the latest releases for specific libraries.
  • Retrieve package metadata: Let your agent pull detailed information about any Npm package, including version history, maintainers, and dependencies.
  • Automated dependency management: Have your agent analyze and update dependencies, check for outdated packages, or suggest upgrades to keep your project secure and efficient.
  • Publishing and versioning: Enable your agent to publish new package versions, update package details, or manage release workflows directly through Npm.
  • Project insights and stats: Get your agent to surface download counts, popularity trends, or other analytics on package usage to inform your development decisions.

Troubleshooting

1. Why does Claude not use the Composio connector for Npm?

The connector can show as connected, but Claude must use it in each Npm conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to Npm again.

2. Why does Claude show an MCP server error before Npm connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Npm.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect Npm.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Npm authorization link not work?

The Composio connector is one server. Your Npm account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the Npm connection.
  • Composio creates a fresh Npm authorization link.
  • Open that link in your browser and finish the Npm sign-in.

4. Why do Npm actions fail after they worked before?

The Npm connection can expire or lose permission.

  • Ask Claude to inspect the Npm connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the Npm account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in Npm.
  • If the action still fails with a permission error, check that the connected account has that permission in Npm itself.

5. How do I switch to a different Npm account?

Claude can manage the Npm connection for you.

  • Ask Claude to disconnect or delete the current Npm account.
  • Ask Claude to connect Npm again.
  • Open the new Composio authorization link for Npm.
  • Sign in with the other Npm account in the browser.
  • After the account connects, ask Claude to retry the Npm task.

6. Why is my Npm connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Npm connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Npm tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Npm.
TOOLS

Supported Tools

Every Npm action and event your agent gets out of the box.

Delete User Token (Legacy)

Tool to delete a user authentication token using the legacy endpoint.

Get All Packages Download Count Point

Get total npm registry download statistics for all packages for a specified time period.

Get NPM Download Counts Point

Get npm package download statistics for a specified time period.

Get NPM Package Download Counts Over Date Range

Tool to get download counts for an npm package over a specified date range.

Get All NPM Packages Download Counts by Period

Tool to get daily download counts for all npm packages over a specified period.

Get Registry Changes Feed

Tool to get a stream of registry changes for replication purposes.

Get NPM Registry Meta

Retrieves npm registry metadata via meta endpoints.

Get NPM Package Version Downloads (Last 7 Days)

Tool to get download counts for specific versions of a package over the last 7 days.

Query Bulk Security Advisories

Tool to bulk query security advisories for multiple npm packages.

Get NPM Package Metadata

Tool to fetch metadata for a specified npm package.

Get NPM Registry Root Metadata

Fetches npm registry root metadata including total package count and update sequence.

Search NPM Packages

Tool to search for packages in the npm registry.

FRAMEWORKS

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OpenAI Agents SDK

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Claude Agent SDK logo

Claude Agent SDK

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Claude Code logo

Claude Code

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Codex logo

Codex

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Kimi Code logo

Kimi Code

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OpenClaw logo

OpenClaw

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Hermes logo

Hermes

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Atomic Agent logo

Atomic Agent

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CLI logo

CLI

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Google ADK logo

Google ADK

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LangChain logo

LangChain

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Vercel AI SDK logo

Vercel AI SDK

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Mastra AI logo

Mastra AI

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LlamaIndex logo

LlamaIndex

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CrewAI logo

CrewAI

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Pydantic AI logo

Pydantic AI

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AutoGen logo

AutoGen

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FAQ

Frequently asked questions

With a standalone Npm MCP server, the agents and LLMs can only access a fixed set of Npm tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Npm and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Claude Cowork fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Npm tools.

Yes, absolutely. You can configure which Npm scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Npm data and credentials are handled as safely as possible.

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