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ニコニコ動画のページからタイトルetc.を取り出す

Last updated at Posted at 2021-01-15

chrome拡張機能を作るときに必要になったので。

タイトル

title
var row_data = document.getElementById('js-initial-watch-data').getAttribute("data-api-data");
var title = JSON.parse(row_data).video.title;

タグをリストで

tags
var row_data = document.getElementById('js-initial-watch-data').getAttribute("data-api-data");
var tags = JSON.parse(row_data).tags;
for(var i=0; i<tags.length; i++){
  console.log(tags[i].name);
}

あとがき

ニコニコ動画はjs-initial-watch-dataというIDの要素のdata-api-data属性にjson形式で様々なデータがくっついています。
このデータには今回取り出したような動画タイトルやタグのほか、コメントも含まれています。

質問、誤りなどあったらコメントください。

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