What is json

JSON is a lightweight data exchange format that is concise, easy to read, cross-platform and language. JSON data is organized in key-value pairs, where the key is a string and the value It can be a string, numeric value, Boolean value, array, object or null. It is widely used in web development, data exchange and configuration files.

JSON (JavaScript Object Notation) is a lightweight data exchange format that represents data in a text format that is easy to read and write. JSON data is organized in key-value pairs, where the key is a string and the value can be a string, a numerical value, a Boolean value, an array, an object, or null.

JSON is widely used in data exchange, especially in web development. It is closely related to the JavaScript language, but is not limited to JavaScript and can be supported and parsed by most programming languages. Compared with other data exchange formats such as XML, JSON is simpler, easier to understand and process.

The syntax rules of JSON are relatively simple, including the following aspects:

Key-value pairs: JSON uses key-value pairs to represent data, and colons (:) are used between keys and values. Separate, use commas (,) to separate multiple key-value pairs.

Object: An object is an unordered collection of key-value pairs, represented by curly braces ({}). Use commas to separate key-value pairs.

Array: An array is an ordered collection of values, represented by square brackets ([]). Use commas to separate values.

Value: The value can be a string, numeric value, Boolean value, array, object or null.

The advantages of JSON include:

High readability: JSON uses text format to represent data and is easy to read and write. Compared with other data exchange formats, JSON has more concise and clear syntax rules.

Cross-platform and language: JSON can be supported and parsed by most programming languages, not just JavaScript. This makes data exchange between different platforms more convenient.

Small data size: JSON data size is relatively small and consumes less network transmission and storage resources.

Simple parsing and processing: JSON has simple syntax rules and is easy to parse and process. Most programming languages ​​provide JSON parsing and generation libraries, making it more convenient to operate JSON data.

Support complex data structures: JSON supports multi-layer nested objects and arrays, which can represent complex data structures.

The application scenarios of JSON include:

Data exchange: JSON is often used in web applications as the data exchange format between the client and the server. Structured data, such as user information, configuration files, etc., can be transmitted through JSON.

Configuration file: JSON can be used as the format of the configuration file to store the configuration information of the application. Compared with other formats such as XML, JSON's syntax rules are more concise and easy to edit and modify.

API interface: JSON is a commonly used data format in modern Web API interfaces. Through JSON, the server can return data to the client in a structured way.

In short, JSON, as a lightweight data exchange format, is concise, easy to read, and cross-platform and language. It is widely used in web development, data exchange and configuration files, etc., providing programmers with an efficient and convenient way of data representation and exchange.

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