The Google Discovery Service API provides a way to build client libraries, IDE plugins, and other tools that interact with Google APIs. It provides a lightweight, JSON-based API that exposes machine-readable metadata about Google APIs, including: a directory of supported APIs, a machine-readable "Discovery document" for each of the supported APIs that includes, a list of API resource schemas based on JSON Schema and more. All calls to the API are unauthenticated, REST requests that are built on two concepts; The APIs Directory: a list of all APIs that are supported by the APIs Discovery Service, and the discovery document; a machine-readable description of a particular API.
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