JSONPlaceholderとは？（APIツールのテスト、プログラミング学習に最適）

JSONPlaceholderは便利なオンライン上のREST APIサービスです。URLにアクセスするだけで、手軽にテストデータをJSONで受け取ることができます。
JSONPlaceholder

実際にAPIを叩いてみた

curlコマンドで実際に叩いてみました。

$ curl -i "https://jsonplaceholder.typicode.com/posts/1"
HTTP/2 200
date: Sat, 09 Nov 2019 09:17:01 GMT
content-type: application/json; charset=utf-8
content-length: 292
set-cookie: __cfduid=d259dcf35f5ee0dbe46d4484f9d84d48d1573291021; expires=Sun, 08-Nov-20 09:17:01 GMT; path=/; domain=.typicode.com; HttpOnly
x-powered-by: Express
vary: Origin, Accept-Encoding
access-control-allow-credentials: true
cache-control: private, max-age=14400
pragma: no-cache
expires: -1
x-content-type-options: nosniff
etag: W/"124-yiKdLzqO5gfBrJFrcdJ8Yq0LGnU"
via: 1.1 vegur
cf-cache-status: HIT
age: 5803
accept-ranges: bytes
expect-ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
server: cloudflare
cf-ray: 532eb0f46b879509-NRT

{
  "userId": 1,
  "id": 1,
  "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
  "body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto"
}

POSTで送信してみました。

$ curl -X POST "https://jsonplaceholder.typicode.com/users" \
-d  "users=junpeko"
{
  "users": "junpeko",
  "id": 11
}%

1段階ネストされたルートも利用可能です。

$ curl "https://jsonplaceholder.typicode.com/users/1/posts"
[
  {
    "userId": 1,
    "id": 1,
    "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
    "body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto"
  },
  {
    "userId": 1,
    "id": 2,
    "title": "qui est esse",
    "body": "est rerum tempore vitae\nsequi sint nihil reprehenderit dolor beatae ea dolores neque\nfugiat blanditiis voluptate porro vel nihil molestiae ut reiciendis\nqui aperiam non debitis possimus qui neque nisi nulla"
  },
  {
    "userId": 1,
    "id": 3,
(以下省略)