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JSON(JavaScript Object Notation) is one of the standard text-based formats used to represent data properly structured with the JavaScript object syntax. It consists of key-value pairs, where the keys are strings and the values can be strings, numbers, booleans, arrays, or other objects. JSON objects are denoted using curly braces {} and contain a set of key-value pairs, separated by commas. The keys are always strings, and the values can be any valid JSON data type. This structured data is used when there is a need for transmitting data from a server to a webpage.