include a bootstrap URL on your page, of the form
https://maps.googleapis.com/maps/api/js. This bootstrap request
available in self-contained libraries which are not loaded unless you
specifically request them. Breaking up supplemental components into libraries
allows the main API to load (and parse) quickly. You only incur the additional
overhead of loading and parsing libraries if you need them.
You can load additional libraries by specifying a
libraries parameter in the bootstrap request, and supplying the
name of the library or libraries. You can specify multiple libraries as a
comma-separated list. You then access the libraries via the
The following libraries are available:
drawingprovides a graphical interface for users to draw polygons, rectangles, polylines, circles, and markers on the map. Consult the Drawing library documentation for more information.
geometryincludes utility functions for calculating scalar geometric values (such as distance and area) on the surface of the earth. Consult the Geometry library documentation for more information.
localContextshows users key places of interest near a location that you specify. Consult the Local Context library documentation for more information.
placesenables your application to search for places such as establishments, geographic locations, or prominent points of interest, within a defined area. Consult the Places library documentation for more information.
visualizationprovides heatmaps for visual representation of data. Consult the Visualization library documentation for more information.
The following bootstrap request illustrates how to request the
google.maps.geometry library of the
<script async src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry&callback=initMap"> </script>
To request multiple libraries, separate them with a comma:
<script async src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry,places&callback=initMap"> </script>