Simple PostgreSQL MCP Server

A minimal Model Context Protocol (MCP) server for executing SQL queries on PostgreSQL databases with configurable permissions.

Features

• Execute SQL queries with optional read-only or write access
• Server-level mode (read-only/write) configurable via command line
• Returns structured results with metadata
• Simple setup using a PostgreSQL connection string

Getting Started

1. Clone the repository

   git clone https://github.com/perrypixel/Simple-Postgres-MCP
   cd Simple-Postgres-MCP
   

2. Install dependencies

   npm install
   

3. Build the project

   npm run build
   

MCP Configuration

Add the following to your MCP client configuration (mcp.json):

Write Mode (default)

{
  "mcpServers": {
    "simple-postgresql-mcp": {
      "command": "node",
      "args": [
        "/path/to/build/index.js",
        "postgresql://username:password@localhost:5432/database_name",
        "write"
      ]
    }
  }
}

Read-Only Mode

{
  "mcpServers": {
    "simple-postgresql-mcp": {
      "command": "node",
      "args": [
        "/path/to/build/index.js",
        "postgresql://username:password@localhost:5432/database_name",
        "readonly"
      ]
    }
  }
}

Note: Update the path in the configuration to point to the index.js file inside your build folder.

Usage

1. Copy the appropriate MCP configuration (read-only or write mode) to your tool’s mcp.json (e.g., Cursor, Windsurf, Copilot, etc.).
2. Start your MCP client. The server is now ready to use!

Support

If you find this tool helpful, you can support the development by:

• Buying me a coffee at https://ko-fi.com/perrypixel
• UPI to kevinp@apl