Firestore, get collection with async/await

Published: March 18, 2020

Today I Learned how to get all documents in a collection in Firestore with async/await and for...of by using the .docs property.

Firebase documentation has examples with .then to get the result from a Promise.

const logCities = () => {
  let citiesRef = db.collection('cities')
  let allCities = citiesRef.get().then((snapshot) => {
    snapshot.forEach((doc) => {
      console.log(doc.id, '=>', doc.data())
    })
  })
}

But it can be written easier with async/await.

const logCities = async () => {
  let citiesRef = db.collection('cities')
  let allCities = await citiesRef.get()
  for (const doc of allCities.docs) {
    console.log(doc.id, '=>', doc.data())
  }
}

I think this is more readable, has fewer lines, and .docs allows us to use for of.