const fetch = require('isomorphic-unfetch') async function getAvailability(name) { const response = await fetch( `https://crates.io/api/v1/crates/${encodeURIComponent(name)}` ) return response.status !== 200 } module.exports = async (req, res) => { const name = req.query.name if (!name) { return res.status(400).json({ error: 'no query given' }) } try { const availability = await getAvailability(name) res.json({ availability }) } catch (err) { res.status(400).json({ error: err.message }) } }