Use the Google API Discovery Service to build client libraries, IDE plugins, and other tools that interact with Google APIs. The Discovery API provides a list of Google APIs and a machine-readable "Discovery Document" for each API. Features of the Discovery API:

• A directory of supported APIs schemas based on JSON Schema.
• A machine-readable "Discovery Document" for each of the supported APIs. Each document contains:
  • A list of API methods and available parameters for each method.
  • A list of available OAuth 2.0 scopes.
  • Inline documentation of methods, parameters, and available parameter values.

• Google API Client Libraries: Client libraries in various languages for accessing Google APIs.
• Google APIs Explorer: An interactive web-based tool for exploring Google APIs.