Google Maps JavaScript API V3 Not Required API Key
2014-08-14
Google Maps JavaScript API V3 does not require an API key, yes, you can choose use an API key or not.
The Google Maps JavaScript API v3 does not require an API key to function correctly. However, we strongly encourage you to load the Maps API using an APIs Console key which allows you to monitor your application's Maps API usage. Learn how to use an APIs Console key.
About API V2, Google has mentioned that they do not recommend (officially deprecated) .
If you do not put API key:
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
If put API key:
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=[Your Key]&sensor=false"></script>