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This article mainly introduces "a brief introduction to JSON". In daily operation, I believe many people have doubts about the brief introduction to JSON. The editor has consulted all kinds of materials and sorted out simple and easy operation methods. I hope it will help you answer the doubts of "a brief introduction to JSON"! Next, please follow the small series to learn together!

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preface

JSON (JavaScript Object Notation): JavaScript Object Notation. It is a lightweight data exchange format, and its concise and clear hierarchy makes it an ideal data exchange language. It is easy for people to read and write, and it is also easy for machines to parse and generate, and effectively improves the efficiency of network transmission. Usually used to exchange data with servers. For example, a JSON format packet in the weather server is:

An example of JSON formatted data is shown in the figure above. Note that there are several important symbols such as curly brackets "{}," square brackets "[]," colons, and quotation marks. The structure of JSON format data is described in detail below. JSON has roughly three structures: JSON objects, JSON arrays, and nested JSON objects and arrays.

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JSON object

JSON objects are simply key-value pairs or name-value pairs in curly braces "{}," and "values" can be numbers, strings, booleans, and so on. A {} represents an object.

"name":"Fuzhou"

This is a key-value pair, where the key is "name" and the value is the string "Fuzhou," separated by a colon. From this, the JSON object format can be roughly summarized as (image from the network):

An object can have one key-value pair or multiple key-value pairs. For example:

{"text":"Sunny","code":"0","temperature":"20"}

There are three key-value pairs in this object, separated by commas. The key-value pairs in an object are called object members.

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JSON array

JOSN arrays are marked with brackets "[]" and the objects in "[]" are array elements. as

This is a JSON array that has one object (objects are enclosed by {}), i.e., the array has one element.

JSON format data packets are composed of JSON objects and JSON arrays nested with each other, that is, the value in each key-value pair may be an array or an object, the array may be nested with objects, and the object may be nested with key-value pairs.

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