How to convert struct to JSON data in Golang?

In Golang, use the encoding/json package to convert the structure into JSON data. The steps are as follows: Install the encoding/json package. Define the structure. Convert the structure to a JSON string using the json.Marshal() function.

#How to convert structure to JSON data in Golang?

In Golang, you can use the encoding/json package to convert structures into JSON data. Here's how to do it:

1. Install the package

go get -u encoding/json

2. Define the structure

type Person struct {
    Name string
    Age  int
}

3 . Convert to JSON

Use the json.Marshal() function to convert the structure to a JSON string:

import "encoding/json"

func main() {
    person := Person{Name: "John", Age: 30}

    jsonBytes, err := json.Marshal(person)
    if err != nil {
        // 处理错误
    }

    jsonString := string(jsonBytes)
    fmt.Println(jsonString)
}

Output:

{"Name":"John","Age":30}

Practical case: REST API

The following is a practical case showing how to convert a structure into JSON data in a REST API:

import (
    "encoding/json"
    "net/http"

    "github.com/gorilla/mux"
)

type Person struct {
    Name string
    Age  int
}

func main() {
    router := mux.NewRouter()

    // 路由用于获取单个人的详细信息
    router.HandleFunc("/person/{name}", func(w http.ResponseWriter, r *http.Request) {
        // 从 URL 中获取名称
        name := mux.Vars(r)["name"]

        // 根据名称查询数据库并获取 Person 结构体
        person := getPersonFromDB(name)

        // 将结构体转换为 JSON
        jsonBytes, err := json.Marshal(person)
        if err != nil {
            // 处理错误
        }

        // 将 JSON 发送到客户端
        w.Header().Add("Content-Type", "application/json")
        w.Write(jsonBytes)
    })

    // 启动服务器
    http.ListenAndServe(":8080", router)
}

In this case , when the client makes a GET request to the /person/{name} endpoint, the server queries the database, obtains a Person structure, and then converts the structure to JSON and sends it to the client.

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