How to get JSON data from server using REST API in Golang?

Steps to obtain JSON data in Golang: Create an HTTP client; use HTTP requests to specify the request method, URL and request body; add HTTP headers; perform HTTP requests; check the response status code; parse the JSON response.

How to use REST API in Golang to get JSON data from the server

In Golang, you can use the net/http package easily Get JSON data from REST API. Here's how to do it:

1. Create an HTTP client

You need to create a client for making HTTP requests.

// 创建一个新的 HTTP 客户端
client := &http.Client{}

2. Create HTTP request

Construct an HTTP request, specify the request method, URL and request body (if necessary).

// 创建一个新的 HTTP 请求
req, err := http.NewRequest(method, url, body)
if err != nil {
    fmt.Println(err)
    return
}

3. Add HTTP headers

You can add HTTP headers to the request as needed.

// 添加 HTTP 头
req.Header.Add("Content-Type", "application/json")

4. Perform HTTP requests

Use the client to perform HTTP requests.

// 执行 HTTP 请求
resp, err := client.Do(req)
if err != nil {
    fmt.Println(err)
    return
}

5. Check the response status code

Check the response status code to ensure the request was successful.

// 检查响应状态代码
if resp.StatusCode != http.StatusOK {
    fmt.Println("请求失败: ", resp.Status)
    return
}

6. Parse JSON response

Use the JSON decoder to decode the JSON response.

// 创建 JSON 解码器
decoder := json.NewDecoder(resp.Body)

// 解析 JSON 响应
var data interface{}
if err := decoder.Decode(&data); err != nil {
    fmt.Println(err)
    return
}

Practical case

Suppose you want to get user data from JSONPlaceholder API, you can use the following code:

func main() {
    // 创建 HTTP 请求
    resp, err := http.Get("https://jsonplaceholder.typicode.com/users")
    if err != nil {
        fmt.Println(err)
        return
    }

    // 检查状态代码
    if resp.StatusCode != 200 {
        fmt.Println(resp.Status)
        return
    }

    // 解析 JSON 响应
    var users []map[string]interface{}
    decoder := json.NewDecoder(resp.Body)
    if err := decoder.Decode(&users); err != nil {
        fmt.Println(err)
        return
    }

    // 打印用户名称
    for _, user := range users {
        fmt.Println(user["name"])
    }
}

This is how to get from the server using REST API in Golang Methods for JSON data.

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