. Hello, Im trying to complete this tutorial but they have left out some key parts in their instructions. Ive figured out some of what was missing but I cant plug in flickr images that are returned by the Photo Search API as a background. Golang json api tutorial. What is the REST API? REST stands for Representational State Transfer.A lot of the services we use everyday have JSON-based APIs: Twitter, Facebook and Flickr all send back data in JSON format. The Flickr API can be used to retrieve photos from the Flickr photo sharing service using a variety of feedsSupported Response Formats JSON, XML, PHP, XML-RPC. Is This an Unofficial API?How HelloSign Fueled 10x Growth in the Digital Signature Landscape. Bing Search API Tutorial.