The Google APIs Explorer is is a tool that helps you explore various Google APIs in a web interface without writing any code.
Google APIs Explorer allows you to:
Browse quickly through available APIs and versions
See methods available for each API and available parameters
Execute API requests for any method and see actual responses in real time.
Make pubic or authenticated API calls
The GoogleAPIs Explorer currently supports only JSON for responses and request payloads, even though some APIs support other data formats like XML and AtomPub.
The Google APIsExplorer provides an quick access tool for developers to discover what APIs Google offers, and enables users to immediately start using.
This type of discovery and instant visualization can be the difference between API adoption or choosing to go with an alternative.
Google APIs Explorer supports the following APIs: