A WFS resource is a URL which, when navigated to, provides data that can be parsed and drawn on a map. This demonstration will use the following URL as an example:

https://geo.pacioos.hawaii.edu/geoserver/PACIOOS/gu_db_all_coastalfeats/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=PACIOOS:gu_db_all_coastalfeats&outputFormat=json

This WFS service supplies information about coastal features in Guam. If we paste this into our browser and navigate to it, we can see some text-based data is shown (in JSON format):

If we look at the highlighted text, we can make some sense of what's being shown here, a list of data with "coordinates" and other descriptors.

NOTE: The map will only work with URLs served over HTTPS, and can only decipher WFS services that are in JSON format. WFS services are usually in XML format, and may look something like this:

If your WFS is in XML, try adding "&outputFormat=json" to the tail of the URL you are using. Many WFS services can be shown in both formats. Once you have your WFS URL displaying in JSON format, you can save it in the map by clicking the plus symbol next to "Feature Layers", and then clicking "New Layer":

A popup will be shown, clicking "WFS" will show this screen:

Only the "Layer Title" and "Service URL" fields are mandatory, the rest are optional. When you have satisfactorily customized the layer, clicking "Next" will save the layer. Clicking the checkbox next to the layer will map it:

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