FileMaker Data API and Portal Filters

We were working on a project where we exposed the FileMaker Data API to some web technologies. The team working on the web side asked for the portal data returned by the Data API to be filtered between a date range.

To achieve this with a relationship would mean having the current date in every parent record, updating it daily. Not the smartest approach, but it would work.

However, we wondered whether portal filters would work — and sure enough, the JSON returned by the Data API was filtered based on the portal filter we placed on the layout.

The Key Takeaway

You can use portal filters on a FileMaker layout and this will translate directly to the FileMaker Data API response.

We also discovered that if you give your portal a layout object name, this too will be reflected in the Data API response object:

{
  "response": {
    "data": [
      {
        "fieldData": { ... },
        "portalData": {
          "portalLayoutObjectName": [ ... ]
        }
      }
    ]
  },
  "messages": [ ... ]
}

Why This Matters

This approach is significantly cleaner than maintaining date fields across parent records. By leveraging portal filters on the layout, you keep your data model simple and let the layout handle the filtering logic. The Data API respects these filters, meaning your web application receives only the relevant portal rows without any additional scripting or API parameters.

If you're building web applications that consume FileMaker Data API responses, this technique can save considerable development time and reduce complexity in both your FileMaker solution and your web front end.