Does json belong to JavaScript?

json belongs to JavaScript. json is a string representation of a JS object. It uses text to represent the information of a JS object. It is a lightweight data exchange format. The json format is syntactically similar to the creation of js The object code is the same, and the json syntax is a subset of the JS object literal notation syntax.

The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.

Does json belong to JavaScript

The relationship between Json and Javascript

JSON is a data format Use the JS object literal representation method to describe, then the syntax for describing JSON is a subset of the JS object literal representation syntax

In fact, it is wrong to say whether the attributes in "JS object literal representation" with or without quotation marks are "JS objects" or "JSON objects". With or without quotation marks, they are both "JS objects". After you add quotation marks, it conforms to the syntax rules of JSON from a grammatical point of view, and the syntax rules of JSON are a subset of the syntax rules of "literal representation of js objects", so no matter how it is expressed, it is a "js object" ". So are there any situations where attributes must be quoted? We know that the naming rules of js for variables are numbers, letters, underscores and $ symbols. This rule is also followed when attributes are not quoted, but if there are these four types in the attributes In addition to other symbols such as "[" or ".", etc., attributes must be expressed in quotation marks.

After all, JSON is a data format, a specification for data, because it has Self-descriptive and concise grammatical rules make it an ideal data exchange format between different languages. JSON exists independently of language. Any interpretation of it from the language perspective and object level is valid. Limitations or errors.

The difference between Json and Javascript

JSON is a string representation of a JS object. It uses text to represent the information of a JS object. It is essentially a string.

1. var obj = {a: 'Hello', b: 'World'}; //This is an object. Note that the key name can also be wrapped in quotes

1. var json = '{"a": "Hello", "b": "World"}'; //This is a JSON string, essentially a string

JSON and JS object conversion

To convert from object to JSON string, use JSON.stringify() method:

1. var json = JSON.stringify({a: 'Hello', b: 'World'}); //The result is '{"a": "Hello", "b": "World"}'

To convert from JSON to object, use JSON.parse( ) Method:

1. var obj = JSON.parse('{"a": "Hello", "b": "World"}'); //The result is {a: 'Hello', b: 'World'}

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