fastmcp/docs/integrations/supabase.mdx

---
title: Supabase 🤝 FastMCP
sidebarTitle: Supabase
description: Secure your FastMCP server with Supabase Auth
icon: shield-check
tag: NEW
---

import { VersionBadge } from "/snippets/version-badge.mdx"

<VersionBadge version="2.13.0" />

This guide shows you how to secure your FastMCP server using **Supabase Auth**. This integration uses the [**Remote OAuth**](/servers/auth/remote-oauth) pattern, where Supabase handles user authentication and your FastMCP server validates the tokens.

## Configuration

### Prerequisites

Before you begin, you will need:
1. A **[Supabase Account](https://supabase.com/)** with a project or a self-hosted **Supabase Auth** instance
2. Your FastMCP server's URL (can be localhost for development, e.g., `http://localhost:8000`)

### Step 1: Get Supabase Project URL

In your Supabase Dashboard:
1. Go to **Project Settings**
2. Copy your **Project URL** (e.g., `https://abc123.supabase.co`)

### Step 2: FastMCP Configuration

Create your FastMCP server using the `SupabaseProvider`:

```python server.py
from fastmcp import FastMCP
from fastmcp.server.auth.providers.supabase import SupabaseProvider

# Configure Supabase Auth
auth = SupabaseProvider(
    project_url="https://abc123.supabase.co",
    base_url="http://localhost:8000",
    # Optional: customize auth_route for self-hosted Supabase Auth with custom routes
    # auth_route="/my/auth/route"
)

mcp = FastMCP("Supabase Protected Server", auth=auth)

@mcp.tool
def protected_tool(message: str) -> str:
    """This tool requires authentication."""
    return f"Authenticated user says: {message}"

if __name__ == "__main__":
    mcp.run(transport="http", port=8000)
```

## Testing

### Running the Server

Start your FastMCP server with HTTP transport to enable OAuth flows:

```bash
fastmcp run server.py --transport http --port 8000
```

Your server is now running and protected by Supabase authentication.

### Testing with a Client

Create a test client that authenticates with your Supabase-protected server:

```python client.py
from fastmcp import Client
import asyncio

async def main():
    # The client will automatically handle Supabase OAuth
    async with Client("http://localhost:8000/mcp", auth="oauth") as client:
        # First-time connection will open Supabase login in your browser
        print("✓ Authenticated with Supabase!")

        # Test the protected tool
        result = await client.call_tool("protected_tool", {"message": "Hello!"})
        print(result)

if __name__ == "__main__":
    asyncio.run(main())
```

When you run the client for the first time:
1. Your browser will open to Supabase's authorization page
2. After you authorize, you'll be redirected back
3. The client receives the token and can make authenticated requests

## Production Configuration

For production deployments, load configuration from environment variables:

```python server.py
import os
from fastmcp import FastMCP
from fastmcp.server.auth.providers.supabase import SupabaseProvider

# Load configuration from environment variables
auth = SupabaseProvider(
    project_url=os.environ["SUPABASE_PROJECT_URL"],
    base_url=os.environ.get("BASE_URL", "https://your-server.com"),
    auth_route=os.environ.get("SUPABASE_AUTH_ROUTE", "/auth/v1"),  # Optional: for custom routes
)

mcp = FastMCP(name="Supabase Secured App", auth=auth)
```