fetchDuckduckgo.js

async function fetchLink(q) {
  const htmlStr = await fetch(
    'https://duckduckgo.com/?q=' + q + '&ia=web'
  ).then((r) => r.text())
  return `https://links.duckduckgo.com/${htmlStr.match(/\/(d.js.+?)&p_ent/)[1]}`
}

async function fetchDuck(q) {
  function transform({ u, t, a, i }) {
    return {
      text: a,
      url: u,
      title: t,
      source: i,
    }
  }

  const link = await fetchLink(q)
  const r = await fetch(link).then((r) => r.text())

  const from = "DDG.pageLayout.load('d',"
  const s = r.indexOf(from)
  const e = r.indexOf(');DDG.', s + from.length)
  const json = r.substring(s + from.length, e)
  const data = JSON.parse(json)

  return data.map(transform).filter(({ title }) => title && title !== 'EOF')
}