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https://github.com/ergut/mcp-bigquery-server

A Model Context Protocol (MCP) server that provides secure, read-only access to BigQuery datasets. Enables Large Language Models (LLMs) to safely query and analyze data through a standardized interface.
https://github.com/ergut/mcp-bigquery-server

bigquery google-cloud mcp mcp-servers model-context-protocol sql

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A Model Context Protocol (MCP) server that provides secure, read-only access to BigQuery datasets. Enables Large Language Models (LLMs) to safely query and analyze data through a standardized interface.

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README 

        
# BigQuery MCP Server

[![smithery badge](https://smithery.ai/badge/@ergut/mcp-bigquery-server)](https://smithery.ai/protocol/@ergut/mcp-bigquery-server)



  BigQuery MCP Server Logo




## What is this? 🤔



This is a server that lets your LLMs (like Claude) talk directly to your BigQuery data! Think of it as a friendly translator that sits between your AI assistant and your database, making sure they can chat securely and efficiently.



### Quick Example

```text

You: "What were our top 10 customers last month?"

Claude: *queries your BigQuery database and gives you the answer in plain English*

```



No more writing SQL queries by hand - just chat naturally with your data!



## How Does It Work? 🛠️



This server uses the Model Context Protocol (MCP), which is like a universal translator for AI-database communication. While MCP is designed to work with any AI model, right now it's available as a developer preview in Claude Desktop.



Here's all you need to do:

1. Set up authentication (see below)

2. Add your project details to Claude Desktop's config file

3. Start chatting with your BigQuery data naturally!



### What Can It Do? 📊



- Run SQL queries by just asking questions in plain English

- Access both tables and materialized views in your datasets

- Explore dataset schemas with clear labeling of resource types (tables vs views)

- Analyze data within safe limits (1GB query limit by default)

- Keep your data secure (read-only access)



## Quick Start 🚀



### Prerequisites

- Node.js 14 or higher

- Google Cloud project with BigQuery enabled

- Either Google Cloud CLI installed or a service account key file

- Claude Desktop (currently the only supported LLM interface)



### Option 1: Quick Install via Smithery (Recommended)

To install BigQuery MCP Server for Claude Desktop automatically via [Smithery](https://smithery.ai/protocol/@ergut/mcp-bigquery-server), run this command in your terminal:



```bash

npx @smithery/cli install @ergut/mcp-bigquery-server --client claude

```

The installer will prompt you for:



- Your Google Cloud project ID

- BigQuery location (defaults to us-central1)



Once configured, Smithery will automatically update your Claude Desktop configuration and restart the application.



### Option 2: Manual Setup

If you prefer manual configuration or need more control:



1. **Authenticate with Google Cloud** (choose one method):

   - Using Google Cloud CLI (great for development):

     ```bash

     gcloud auth application-default login

     ```

   - Using a service account (recommended for production):

     ```bash

     # Save your service account key file and use --key-file parameter

     # Remember to keep your service account key file secure and never commit it to version control

     ```



2. **Add to your Claude Desktop config**

   Add this to your `claude_desktop_config.json`:



   - Basic configuration:

     ```json

     {

       "mcpServers": {

         "bigquery": {

           "command": "npx",

           "args": [

             "-y",

             "@ergut/mcp-bigquery-server",

             "--project-id",

             "your-project-id",

             "--location",

             "us-central1"

           ]

         }

       }

     }

     ```



   - With service account:

     ```json

     {

       "mcpServers": {

         "bigquery": {

           "command": "npx",

           "args": [

             "-y",

             "@ergut/mcp-bigquery-server",

             "--project-id",

             "your-project-id",

             "--location",

             "us-central1",

             "--key-file",

             "/path/to/service-account-key.json"

           ]

         }

       }

     }

     ```

     



3. **Start chatting!** 

   Open Claude Desktop and start asking questions about your data.



### Command Line Arguments



The server accepts the following arguments:

- `--project-id`: (Required) Your Google Cloud project ID

- `--location`: (Optional) BigQuery location, defaults to 'us-central1'

- `--key-file`: (Optional) Path to service account key JSON file



Example using service account:

```bash

npx @ergut/mcp-bigquery-server --project-id your-project-id --location europe-west1 --key-file /path/to/key.json

```



### Permissions Needed



You'll need one of these:

- `roles/bigquery.user` (recommended)

- OR both:

  - `roles/bigquery.dataViewer`

  - `roles/bigquery.jobUser`



## Developer Setup (Optional) 🔧



Want to customize or contribute? Here's how to set it up locally:



```bash

# Clone and install

git clone https://github.com/ergut/mcp-bigquery-server

cd mcp-bigquery-server

npm install



# Build

npm run build

```



Then update your Claude Desktop config to point to your local build:

```json

{

  "mcpServers": {

    "bigquery": {

      "command": "node",

      "args": [

        "/path/to/your/clone/mcp-bigquery-server/dist/index.js",

        "--project-id",

        "your-project-id",

        "--location",

        "us-central1",

        "--key-file",

        "/path/to/service-account-key.json"

      ]

    }

  }

}

```



## Current Limitations ⚠️



- MCP support is currently only available in Claude Desktop (developer preview)

- Connections are limited to local MCP servers running on the same machine

- Queries are read-only with a 1GB processing limit

- While both tables and views are supported, some complex view types might have limitations



## Support & Resources 💬



- 🐛 [Report issues](https://github.com/ergut/mcp-bigquery-server/issues)

- 💡 [Feature requests](https://github.com/ergut/mcp-bigquery-server/issues)

- 📖 [Documentation](https://github.com/ergut/mcp-bigquery-server)



## License 📝



MIT License - See [LICENSE](LICENSE) file for details.



## Author ✍️ 



Salih Ergüt



## Sponsorship



This project is proudly sponsored by:





  

    OREDATA

  




## Version History 📋



See [CHANGELOG.md](CHANGELOG.md) for updates and version history.