Node.js でデータをダウンロードする方法

Takahiro Iwasa

Nov 25, 2023

1 min read

Node.js

Node.js でデータをダウンロードしたい場合、ネイティブの Fetch API を使用できます。

developer.mozilla.org

Using the Fetch API - Web APIs | MDN

The Fetch API provides a JavaScript interface for accessing and manipulating parts of the protocol, such as requests and responses. It also provides a global fetch() method that provides an easy, logical way to fetch resources asynchronously across the network.

以下は TypeScript の例です。

import fs from 'fs';

export async function download(url: string, file: string): Promise<void> {
  const response = await fetch(url);
  if (!response.ok) {
    return;
  }
  const data = Buffer.from(await response.arrayBuffer());
  fs.writeFileSync(file, data);
}