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Google Apps Script: HTTP APIを呼び出してJSONを取得する方法

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Google Apps Script(GAS)で外部のHTTP APIを呼び出し、そのレスポンスからJSONデータを取り出す方法です。

GASで外部サイトにHTTPリクエストを送るには、UrlFetchApp.fetchを使います。その戻り値はHTTPResponseです。HTTPResponse.getContentTextでレスポンスボディーが得られるので、それをJSONパースすることでデータが得られます。

function fetchJson(url) {
    const res = UrlFetchApp.fetch(url);
    return JSON.parse(res.getContentText());
}

使い方

function example() {
    const users = fetchJson("https://jsonplaceholder.typicode.com/users");
    console.log(users[0].name); //=> "Leanne Graham"
}
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