InstagramEmbed.js

const { URL } = require('url');
import fetch from 'node-fetch';

export const shouldTransform = url => {
  const { host, pathname } = new URL(url);
  return (
    [
      'instagram.com',
      'www.instagram.com',
      'instagr.am',
      'www.instagr.am',
    ].includes(host) &&
    pathname.includes('/p/') &&
    !pathname.endsWith('/embed')
  );
};

export const getHTML = url =>
  fetch(`https://api.instagram.com/oembed/?url=${url}`)
    .then(r => r.json())
    .then(data => {
      const w = data.thumbnail_width;
      const h = data.thumbnail_height;
      const width = w / 2;
      const height = h / 2 + 210;
      const lastChar = url[url.length - 1];
      const iframeUrl = url + (lastChar == '/' ? '' : '') + 'embed';
      return `<iframe src="${iframeUrl}" width="${width}" height="${height}" frameborder="0"></iframe>`;
    });