const express = require('express');
const router = express.Router();
const admin = require('firebase-admin');
const db = admin.database();
...
router.use('/create-user', (req, res) => {
  console.log('createUser: req', req.body);
    admin.auth().createUser({
      email: req.body.emailAddress,
      emailVerified: false,
      password: req.body.pass,
      displayName: "Harry Lincoln"
    })
    .then(function(userRecord) {
      // See the UserRecord reference doc for the contents of userRecord.
      console.log("Successfully created new user:", userRecord);
      console.log("Continuing to set new stuff...");
      const ref = db.ref("users");
      ref.child(userRecord.uid).set({
          displayName: userRecord.displayName,
          test: 'test',
          age: 28,
          occupation: 'frontend dev',
          hobbies: ['photography', 'coding', 'music']
      });
      res.json({
        message: 'Completed BE task, user record updated',
        user: userRecord
      });
      console.log("Finished setting new stuff");
    })
    .catch(function(error) {
      console.log("Error creating new user:", error);
    });
});
...