For a lot of organizations, when it comes to location, geofencing is often a very desirable or required feature. In case you’re unfamiliar, a geofence can be thought of as a virtual perimeter for a geographic area. Often, you’ll want to know when something enters or exits that geofence so that you can apply your own business logic. Such logic might include sending a notification or updating something in your database.

MongoDB supports GeoJSON data and offers quite a few operators that make working the location data easy.

When it comes to geofencing, why would you want to use a database like MongoDB rather than defining boundaries directly within your client-facing application? Sure, it might be easy to define and manage one or two boundaries, but when you’re working at scale, checking to see if something has exited or entered one of many boundaries could be a hassle.

In this tutorial, we’re going to explore the $near and $geoIntersects operators within MongoDB to define geofences and see if we’re within the fences. For the visual aspect of things, we’re going to make use of Mapbox for showing our geofences and our location.

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