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Go Snippet: 最小限の JSON API サーバー

Last updated at Posted at 2021-03-02

シンプルな JSON API サーバー。
コピペ用

コード

package main

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

type Post struct {
    ID    int    `json:"id"`
    Title string `json:"title"`
    Body  string `json:"body"`
}

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        w.Header().Add("Content-Type", "application/json")
        if err := json.NewEncoder(w).Encode(&Post{ID: 1, Title: "hello", Body: "world"}); err != nil {
            http.Error(w, err.Error(), http.StatusInternalServerError)
        }
    })
    log.Fatalln(http.ListenAndServe(":8080", nil))
}

確認

ブラウザから http://localhost:8080/ にアクセスする

{
    id: 1,
    title: "hello",
    body: "world"
}

curl -i http://localhost:8080/ でアクセスする

HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: 40

{"id":1,"title":"hello","body":"world"}
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