How to convert data to json in golang

1. What is JSON?

JSON, which stands for JavaScript Object Notation, is a lightweight data exchange format. Its biggest feature is its high readability. Data in JSON format is easy to read and parse, and is also very suitable for data exchange with servers and clients.

2. JSON in golang

Golang (also known as Go language) is a new programming language that supports JSON format by default. This means that data exchange using JSON becomes very easy.

The JSON package in Golang provides two methods, marshal and unmarshal, which can convert a structure or map into a JSON object, or convert a JSON object into a structure or map.

3. Use JSON for data exchange in Golang

3.1 Convert the structure into a JSON object

In Golang, you can define a structure to store data. For example, a structure can be defined as follows:

type person struct {
    Name string `json:”name”`
    Age int `json:”age”`
    Address string `json:”address”`
}

If you want to convert a person instance into a JSON object, you can use the marshal function provided by the JSON package:

p := person{Name: "John", Age: 25, Address: "123 Main Street"}
b, err := json.Marshal(p)
if err != nil {
    panic(err)
}
fmt.Println(string(b))

In the above code, we define A person instance named p and then convert it to a JSON object using the marshal function provided by the JSON package. The converted JSON object is stored in the b variable and can be printed using the Println function from the fmt package.

3.2 Convert JSON object to structure

If we receive a JSON object and want to convert it to a structure, we can use the unmarshal function provided by the JSON package. For example, suppose we have received the following JSON string:

{
    "name": "John",
    "age": 25,
    "address": "123 Main Street"
}

You can define a structure to store this data:

type person struct {
    Name string `json:"name"`
    Age int `json:"age"`
    Address string `json:"address"`
}

Then, you can use the unmarshal function provided by the JSON package to convert the JSON object For the structure:

var p person
err := json.Unmarshal([]byte(jsonStr), &p)
if err != nil {
    panic(err)
}
fmt.Println(p)

In the above code, we define a person instance named p, and then use the unmarshal function provided by the JSON package to convert the JSON object into the instance. The converted person instance is stored in the p variable and can be printed using the Println function from the fmt package.

4. Data exchange with other programming languages

Since JSON is a universal data exchange format, applications written using Golang can exchange data between different programming languages. . For example, when developing a web application using Golang, you can send JSON data to front-end JavaScript and parse it in JavaScript.

5. Advantages of JSON

JSON is undoubtedly an excellent data format, and its biggest advantage is that the data is very readable. Compared with other data formats (such as binary formats), JSON is easier and more convenient to read.

In addition, the JSON package that comes with Golang is quite easy to use. Developers can easily convert their own data into JSON format and exchange data with other programming languages.

6. Summary

As a lightweight and highly readable data exchange format, JSON is widely used in different programming languages. The JSON package provided by Golang is very easy to use and makes data conversion easier. In the future, we can consider using JSON for data exchange when writing web applications.

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