How to introduce json into nodejs

In nodejs development, JSON is generally used to represent the transmission and storage of data. It is a lightweight data exchange format, easy to read and write, and is widely used in various fields, including network communications and Web development. , mobile applications, etc.

In nodejs, we can introduce JSON files through require, similar to introducing other modules. The following are the specific steps to introduce a JSON file:

1. Create a .json file

First, create a .json file locally or on the server. This file can contain The required JSON data.

For example, if we want to introduce a JSON file named data.json into nodejs, we can add the following data to the file:

{
  "name": "张三",
  "age": 25,
  "city": "北京"
}

2. Introducing JSON files into nodejs

In nodejs, we can introduce the JSON file through the require function. The specific code is as follows:

const data = require('./data.json');

In the above code, we have introduced the data.json file through the require function, and Assign it to the variable data. Among them, ./ represents the directory where the current file is located, or it can be another file path.

3. Using JSON data

Once we have successfully introduced the JSON file, we can access the data in it through the variable data. For example, we can print out the name attribute in the JSON file with the following code:

console.log(data.name);

This will output "Zhang San", which is the value of the name attribute in the JSON file.

It should be noted that in some cases, we may need to convert JSON data into object or array form for operation. This can be achieved through the JSON.parse function, for example:

const dataObj = JSON.parse(data);

This converts the JSON data in data into object format and assigns it to the dataObj variable, which can be further processed and manipulated.

In short, introducing JSON files into nodejs is very simple, just use the require function. If you need to convert JSON data into an object or array, you can use the JSON.parse function.

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