Golang-json parsing

Go has a built-in encoding/jsonpackage that can easily parse json strings into structures, or parse structures into json strings.

Convert json string to structure:

json.NewDecoder(r.Body).Decode(&user)

Structure to json string:

json.NewEncoder(w).Encode(peter)

By adding after the structure field

 `json：“xxx” `

In order to convert the field into a specific json field, otherwise it will be output as the original field.

Full code:

package main

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

type User struct {
    
    
    Firstname string `json:"firstname"`
    Lastname  string `json:"lastname"`
    Age       int    `json:"age"`
}

func main() {
    
    
    http.HandleFunc("/decode", func(w http.ResponseWriter, r *http.Request) {
    
    
        var user User
        json.NewDecoder(r.Body).Decode(&user)

        fmt.Fprintf(w, "%s %s is %d years old!", user.Firstname, user.Lastname, user.Age)
    })

    http.HandleFunc("/encode", func(w http.ResponseWriter, r *http.Request) {
    
    
        peter := User{
    
    
            Firstname: "John",
            Lastname:  "Doe",
            Age:       25,
        }

        json.NewEncoder(w).Encode(peter)
    })

    http.ListenAndServe(":8080", nil)
}

verify:

visit/decode	visit /encode