LeetCode MCP Server

The LeetCode MCP Server is a Model Context Protocol (MCP) server that provides seamless integration with LeetCode APIs, enabling advanced automation and intelligent interaction with LeetCode's programming problems, contests, solutions, and user data.

Features

• 🌐 Multi-site Support: Support​ both leetcode.com (Global) and leetcode.cn (China) platforms
• 🔌 Dual Transport Modes: Run as a stdio process (default) or as a Streamable HTTP server for web-based integrations
• 📊 Problem Data Retrieval: Obtain detailed problem descriptions, constraints, examples, official editorials, and ​user-submitted solutions
• 👤 User Data Access: Retrieve user profiles, submission history, and contest performance
• 🔒 ​Private Data Access: Create and query user notes, track problem-solving progress, and analyze submission details (AC/WA analysis)
• 🔍 Advanced Search Capabilities: Filter problems by tags, difficulty levels, categories, and keywords
• 📅 Daily Challenge Access: Easily access daily challenge problems

Prerequisites

1. Node.js (v20.x or above)
2. (Optional) LeetCode session cookie for authenticated API access

Installation

# Install from npm
npm install @jinzcdev/leetcode-mcp-server -g

# Run with Global site configuration (stdio transport, default)
npx -y @jinzcdev/leetcode-mcp-server --site global

# Run with authentication (for accessing private data)
npx -y @jinzcdev/leetcode-mcp-server --site global --session <YOUR_LEETCODE_SESSION_COOKIE>

# Run as a Streamable HTTP server
npx -y @jinzcdev/leetcode-mcp-server --transport http --port 3000 --site global

Alternatively, you can clone the repository and run it locally:

# Clone the repository
git clone https://github.com/jinzcdev/leetcode-mcp-server.git

# Navigate to the project directory
cd leetcode-mcp-server

# Build the project
npm install && npm run build

# Run the server (stdio transport)
node build/index.js --site global

# Or run as a Streamable HTTP server
node build/index.js --transport http --port 3000 --site global

Usage

The server supports two transport modes:

Command-Line Options

MCP Client Configuration (stdio)

Add the following server entry to your MCP client configuration file:

Option 1: Using Environment Variables

{
  "mcpServers": {
    "leetcode": {
      "command": "npx",
      "args": ["-y", "@jinzcdev/leetcode-mcp-server"],
      "env": {
        "LEETCODE_SITE": "global",
        "LEETCODE_SESSION": "<YOUR_LEETCODE_SESSION_COOKIE>"
      }
    }
  }
}

Option 2: Using Command Line Arguments

{
  "mcpServers": {
    "leetcode": {
      "command": "npx",
      "args": [
        "-y",
        "@jinzcdev/leetcode-mcp-server",
        "--site",
        "global",
        "--session",
        "<YOUR_LEETCODE_SESSION_COOKIE>"
      ]
    }
  }
}

For LeetCode China site, modify the --site parameter to cn.

[!NOTE]

The exact configuration file location and JSON structure may vary by MCP client. Some clients use an mcp.servers wrapper or a type field — refer to your client's documentation and adapt the example accordingly.

MCP Client Configuration (Streamable HTTP)

First, start the server in HTTP mode:

npx -y @jinzcdev/leetcode-mcp-server --transport http --port 3000 --site global

Then connect your MCP client to the running server:

{
  "mcpServers": {
    "leetcode": {
      "type": "http",
      "url": "http://127.0.0.1:3000/mcp"
    }
  }
}

To use authenticated endpoints, pass the session cookie when starting the server:

npx -y @jinzcdev/leetcode-mcp-server --transport http --port 3000 --site global --session <YOUR_LEETCODE_SESSION_COOKIE>

[!NOTE] Some MCP clients use "type": "http" or "type": "streamableHttp" alongside the url field. Refer to your client's documentation for the exact HTTP transport configuration format.

[!TIP]

The server supports the following optional environment variables:

• LEETCODE_SITE: LeetCode API endpoint (global or cn, default: global)
• LEETCODE_SESSION: LeetCode session cookie for authenticated API access (default: empty)
• LEETCODE_TRANSPORT: Transport mode (stdio or http, default: stdio)
• LEETCODE_HTTP_PORT: HTTP server port when using Streamable HTTP (default: 3000)
• LEETCODE_HTTP_HOST: HTTP server host when using Streamable HTTP (default: 127.0.0.1)
• LEETCODE_HTTP_ENDPOINT: HTTP endpoint path when using Streamable HTTP (default: /mcp)

Priority Note: Command-line arguments take precedence over environment variables when both are specified. For example:

• If LEETCODE_SITE=cn is set but you run leetcode-mcp-server --site global, the server will use global.
• If LEETCODE_SESSION exists but you provide --session "new_cookie", the command-line session value will be used.

Available Tools

Problems

Users

Submissions

Notes