Migrate Firebase Realtime Database to Firestore

Question

I am looking for the best way to migrate my apps database which is using firebase realtime database to the new Cloud Firestore database. I am confident for the project I am

Answer 1

I wrote up a little node script that migrated things in a quick and dirty way and it worked quite nicely.

It is below if anyone else is interested.

Note: This should only be used if your data model in the realtime database was completely flat and did not have much nested data, and you intend on keeping your data flat as well in Firestore

To run this script just create a node file called index.js and throw it in a directory along with your service account file and raw json file from the realtime database export and run the following from command line.

$ node index.js

Script implementation below.

const admin = require('firebase-admin');

var serviceAccount = require("./config.json");
var database = require("./database.json");
var async = require ('async');

admin.initializeApp({
  credential: admin.credential.cert(serviceAccount)
});

var db = admin.firestore();

var allEntityNames = Object.keys(database);

var asyncTasks = [];

for (var i in allEntityNames) {
  var entityName = allEntityNames[i];
  var entity = database[entityName];
  var entityKeys = Object.keys(entity);

  console.log("began migrating "+ entityName);
  for (var j in entityKeys) {
    var entityKey = entityKeys[j];
    var dict = entity[entityKey];
    asyncTasks.push(function(callback){
      db.collection(entityName).doc(entityKey).set(dict)
        .then(function() {
          callback();
        })
        .catch(function(error) {
          console.log(error);
          callback();
        });
    });
  }
  async.parallel(asyncTasks, function(){
    console.log("Finished migrating "+ entityName);
  });
}