Documenting FileMaker API Integrations

Intermediate

Write clear, maintainable API documentation for FileMaker integrations using OpenAPI, inline code comments, and living documentation patterns.

What you'll learn

How to write an OpenAPI spec that wraps the FM Data API
How to document FM-specific error codes in your API
How to use JSDoc to document client library functions
How to maintain living documentation that stays in sync with the code

Undocumented integrations become maintenance nightmares the moment the original developer leaves. Good API documentation explains the FM-specific quirks (error code semantics, portal data structure, session management) that are not obvious from the raw HTTP spec. OpenAPI files, inline JSDoc, and example request/response pairs form a complete picture.

1/4

OpenAPI spec skeleton for a FM-backed API

Define paths that map to your middleware endpoints, not directly to FM. Document the request/response shapes your clients see (post-transformation), not the raw FM envelope.

TEXT

openapi: 3.1.0
info:
  title: CRM API (FileMaker-backed)
  version: 1.0.0
paths:
  /contacts:
    get:
      summary: List active contacts
      parameters:
        - name: status
          in: query
          schema: { type: string, enum: [Active, Prospect, Inactive] }
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                type: object
                properties:
                  count: { type: integer }
                  records:
                    type: array
                    items:
                      $ref: '#/components/schemas/Contact'
        '404':
          description: No records matched the criteria

Automated Testing for FileMaker API Integrations Error Handling Patterns for FileMaker API Integrations