API Directory

The following Google services provide APIs that implement the Google Data Protocol.

Each API has its own set of guides and resources, including information about using client libraries. If you're trying to accomplish a certain task with an API, the Developer's Guide for that API should point you in the right direction. Most APIs also include code samples and other easy ways to get started.

API Home	Guides	Client Libraries
Google Analytics Data Export API	Developer's Guide Reference Guide	Client Libraries and Sample Code (JS, Java, PHP, Python, Ruby)
Google Apps APIs	List of All Apps APIs
Google Base Data API	Developer's Guide Reference Guide
Blogger Data API	Developer's Guide Reference Guide	Client Libraries and Sample Code (Java, .NET, PHP, Python, JS, Obj-C)
Google Booksearch Data API	Developer's Guide Reference Guide	Client Libraries and Sample Code (Java, PHP)
Google Calendar Data API	Developer's Guide Reference Guide	Client Libraries and Sample Code (Java, .NET, PHP, Python, JS, Obj-C)
Google Code Search Data API	Developer's Guide Reference Guide
Google Contacts Data API	Developer's Guide Reference Guide	Client Libraries and Sample Code (Java, .NET, Python, JS, Obj-C)
Google Documents List Data API	Developer's Guide Reference Guide	Client Libraries and Sample Code (Java, .NET, PHP, Python, Obj-C)
Google Finance Portfolio Data API	Developer's Guide Reference Guide
Google Health Data API	Developer's Guide Reference Guide	Client Libraries and Sample Code (Java, .NET, PHP, Python, Ruby)
Google Maps Data API	Developer's Guide Reference Guide
Picasa Web Albums Data API	Developer's Guide Reference Guide	Client Libraries and Sample Code (Java, .NET, PHP, Python, Obj-C)
Google Sidewiki Data API	Developer's Guide Reference Guide	Client Libraries and Sample Code (Java, JavaScript)
Google Sites Data API	Developer's Guide Reference Guide	Client Libraries and Sample Code (Java, .NET, PHP, Python, Obj-C)
Google Spreadsheets Data API	Developer's Guide Reference Guide	Client Libraries and Sample Code (Java, .NET, PHP, Python, Obj-C)
Google Translator Toolkit Data API	Developer's Guide Reference Guide
Google Webmaster Tools Data API	Developer's Guide Reference Guide
YouTube Data API	Developer's Guide	Client Libraries and Sample Code (Java, .NET, PHP, Python, Obj-C)