chore: split app into api and web

api/services/cratesio.js

@@ -0,0 +1,23 @@
+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 })
+  }
+}