namae/api/services/cratesio.js

const fetch = require('isomorphic-unfetch')
const { send, sendError } = require('../util/http')

module.exports = async (req, res) => {
  const name = req.query.name

  if (!name) {
    return res.status(400).json({ error: 'no query given' })
  }

  try {
    const response = await fetch(
      `https://crates.io/api/v1/crates/${encodeURIComponent(name)}`
    )
    const availability = response.status !== 200
    send(res, availability)
  } catch (err) {
    sendError(res, err)
  }
}