n8n Workflow Validator MCP server

This MCP server for n8n provides validation tools, integration capabilities, and workflow management features to enhance your n8n automation projects. It helps ensure your workflows follow best practices and can integrate smoothly with NextJS applications.

Prerequisites

• Node.js (v16 or higher)
• pnpm (v7 or higher)
• An n8n instance (local or remote, such as your Cloudron instance on n8n.bienquoi.com)

Installation

1. Clone the repository or navigate to the project folder
2. Install dependencies:

pnpm install

3. Configure environment variables:

cp .env.example .env

4. Edit the .env file with your n8n API connection information.

Usage

Building the Project

pnpm build

Starting the Server

pnpm start

The MCP server will be accessible at http://localhost:3000 (or the port specified in your .env file).

Using with Claude Desktop

To use this MCP server with Claude Desktop, configure the claude_desktop_config.json file in the %APPDATA%/Claude/ folder:

{
  "mcpServers": {
    "n8n-mcp-server": {
      "command": "node",
      "args": ["/absolute/path/to/mcp-n8n-server/dist/server.js"]
    }
  }
}

Available Tools

N8nApiTool

Interacts directly with the n8n API.

// Usage example
{
  "method": "GET",
  "endpoint": "/workflows",
  "params": "?active=true"
}

WorkflowManagerTool

Manages n8n workflows (list, retrieve, create, update, delete, export, import).

// Usage example
{
  "action": "list",
  "tags": "production"
}

NextJSIntegrationTool

Generates NextJS integrations for n8n workflows.

// Usage example
{
  "workflowId": "123",
  "outputDir": "./my-nextjs-app/pages/api",
  "generateTypes": true,
  "generateOpenAPI": true
}

WorkflowValidatorTool

Validates n8n workflows according to different criteria.

// Usage example
{
  "workflow": "{...}",
  "validators": ["naming", "errorHandling", "security"],
  "strictness": "high"
}

The validator checks for:

• Naming conventions
• Error handling
• Security
• Performance
• Documentation

How to add this MCP server to Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > MCP and click "Add new global MCP server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "cursor-rules-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "cursor-rules-mcp"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explictly ask the agent to use the tool by mentioning the tool name and describing what the function does.