Fillout.io MCP Server

MCP Server for the Fillout.io API, enabling form management, response handling, and analytics.

Token Setup

1. Get your Fillout.io API Key:

   • Log in to your Fillout.io account

   • Go to Account Settings → API & Webhooks

   • Click "Create new API Key"

   • Copy your new API key

2. API Key Information:

   • Production keys start with fo_live_

   • Test keys start with fo_test_

   • Test keys only work with test forms

   • API keys provide access to all resources in your account

3. Replace your-fillout-api-key in the configuration with your API key.

⚠️ Security Notes:

• Keep your API key secure and private

• Use test keys for development

• Store keys in environment variables

• Rotate keys periodically

• Never commit keys to version control

Related MCP server: Loxo MCP Server

Token Troubleshooting

Common Error Messages

1. "Invalid API key provided" or "Authentication failed"

   • Cause: API key is missing, malformed, or invalid

   • Solution:

     • Verify key starts with fo_live_ or fo_test_

     • Check for extra spaces or characters

     • Ensure environment variable is set correctly

     • Create a new key if necessary

2. "Test mode key used with live form"

   • Cause: Using test key (fo_test_) with production form

   • Solution:

     • Use live key for production forms

     • Create test form for development

     • Switch to appropriate key type

3. "Rate limit exceeded"

   • Cause: Too many API requests

   • Solution:

     • Implement request throttling

     • Check usage in dashboard

     • Optimize request patterns

Validation Steps

1. Check API Key Format:

   # Key should:
   - Start with 'fo_live_' or 'fo_test_'
   - Be approximately 50 characters
   - Contain only letters, numbers, and underscores

2. Test API Key:

   curl -H "Authorization: Bearer your-api-key" \
     https://api.fillout.com/v1/api/forms

Features

Form Management

• List all forms

• Get form details

• Create new forms

• Delete forms

• Update form settings

Response Handling

• Submit form responses

• Get form submissions

• Filter responses

• Export responses

Analytics

• Response rates

• Completion times

• Submission trends

Tools

1. list_forms

   • Get all accessible forms

   • Parameters:

     • limit (optional): Number of forms to return

     • offset (optional): Pagination offset

   • Returns: Array of form objects

2. get_form

   • Get detailed form information

   • Parameters:

     • formId (string): Form identifier

   • Returns: Form details including questions and settings

3. create_form

   • Create a new form

   • Parameters:

     • name (string): Form name

     • description (optional string): Form description

     • questions (array): Array of question objects

       • type: Question type (e.g., 'ShortAnswer', 'MultipleChoice')

       • name: Question text

       • required: Whether question is required

       • choices: Array of choices for multiple choice questions

   • Returns: Created form object

4. get_form_responses

   • Get form submissions

   • Parameters:

     • formId (string): Form identifier

     • filters (optional): Response filters

     • pageSize (optional): Results per page

     • afterDate (optional): Filter by submission date

     • beforeDate (optional): Filter by submission date

     • status (optional): Filter by completion status

   • Returns: Array of form responses

5. submit_form_response

   • Submit a new response

   • Parameters:

     • formId (string): Form identifier

     • responses (array): Array of answers

       • questionId: Question identifier

       • value: Response value

     • calculations (optional): Custom calculations

   • Returns: Submission confirmation

Setup

Usage with Claude Desktop

Docker Configuration

{
  "mcpServers": {
    "fillout": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "FILLOUT_API_KEY",
        "mcp/fillout"
      ],
      "env": {
        "FILLOUT_API_KEY": "your-fillout-api-key"
      }
    }
  }
}

NPX Configuration

{
  "mcpServers": {
    "fillout": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-fillout"
      ],
      "env": {
        "FILLOUT_API_KEY": "your-fillout-api-key"
      }
    }
  }
}

Building

Prerequisites

• Node.js 18 or later

• npm or yarn

• Docker (optional)

Local Development

# Install dependencies
npm install

# Run in development mode
npm run dev

# Build for production
npm run build

Docker Build

# Build image
docker build -t mcp/fillout .

# Run container
docker run -e FILLOUT_API_KEY=your-key mcp/fillout

Examples

Creating a Form

const form = await client.createForm({
  name: "Customer Feedback",
  description: "Please share your experience",
  questions: [
    {
      type: "ShortAnswer",
      name: "What did you like most?",
      required: true
    },
    {
      type: "MultipleChoice",
      name: "Would you recommend us?",
      required: true,
      choices: ["Yes", "No", "Maybe"]
    }
  ]
});

Submitting a Response

const response = await client.submitFormResponse(formId, {
  responses: [
    {
      questionId: "q1",
      value: "Great customer service!"
    },
    {
      questionId: "q2",
      value: "Yes"
    }
  ]
});

Error Handling

The server provides detailed error messages for common issues:

try {
  const forms = await client.listForms();
} catch (error) {
  if (error instanceof AuthenticationError) {
    // Handle invalid API key
  } else if (error instanceof FilloutError) {
    // Handle API-specific errors
  } else {
    // Handle unexpected errors
  }
}

License

This project is licensed under the MIT License. See the LICENSE file for details.