better error handling

server/index.js

@@ -12,11 +12,19 @@ app.listen(process.env.PORT, () => {
 })
 
 let db
+async function connectToMongo() {
+  try {
     const mongoUrl = `mongodb://${process.env.MONGO_SERVER}:27017`
-MongoClient.connect(mongoUrl, { useNewUrlParser: true }).then(client => {
+    const client = await MongoClient.connect(mongoUrl, { useNewUrlParser: true })
     db = client.db(process.env.MONGO_DB)
     console.log('Connected succesfully to server')
-}).catch(err => console.log(err))
+  } catch (e) {
+    console.log(e)
+    setTimeout(connectToMongo, 5000)
+  }
+}
+
+connectToMongo()
 
 app.use(function (req, res, next) {
   res.header('Access-Control-Allow-Origin', '*')