Fillout.io MCP Server

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

Token Setup

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
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
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

Token Troubleshooting

Common Error Messages

"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
"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
"Rate limit exceeded"
- Cause: Too many API requests
- Solution:
  - Implement request throttling
  - Check usage in dashboard
  - Optimize request patterns

Validation Steps

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

list_forms
- Get all accessible forms
- Parameters:
  - limit (optional): Number of forms to return
  - offset (optional): Pagination offset
- Returns: Array of form objects
get_form
- Get detailed form information
- Parameters:
  - formId (string): Form identifier
- Returns: Form details including questions and settings
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
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
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.