How to pass data from the Golang backend to the frontend?

2 years ago
Ava Mitchell
1 minute

There are several ways in which the backend of Go language can transfer data to the frontend.

  1. JSON encoding
  2. convert JSON data into a JavaScript object
import (
    "encoding/json"
    "net/http"
)

type Person struct {
    Name string `json:"name"`
    Age  int    `json:"age"`
}

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        person := Person{
            Name: "John",
            Age:  25,
        }
        json.NewEncoder(w).Encode(person)
    })

    http.ListenAndServe(":8080", nil)
}
  1. template using html
import (
    "html/template"
    "net/http"
)

type Person struct {
    Name string
    Age  int
}

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        person := Person{
            Name: "John",
            Age:  25,
        }
        tmpl, _ := template.ParseFiles("index.html")
        tmpl.Execute(w, person)
    })

    http.ListenAndServe(":8080", nil)
}
  1. WebSocket library for the programming language Go.
  2. A communication protocol that enables real-time two-way interaction between a server and a client over a single, long-lived connection.
import (
    "net/http"
    "github.com/gorilla/websocket"
)

var upgrader = websocket.Upgrader{
    ReadBufferSize:  1024,
    WriteBufferSize: 1024,
}

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        conn, _ := upgrader.Upgrade(w, r, nil)
        for {
            _, message, _ := conn.ReadMessage()
            conn.WriteMessage(1, message)
        }
    })

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

These are several common options, choose the appropriate method based on specific needs.

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