After watching Firebase Cloud Function Tutorial - REST API Part 1 | Diligent Dev, I have spent several hours trying to understand how to get the entire record that was posted into firestore. Here is index.js code:

const functions = require("firebase-functions");
const express = require("express");
const cors = require("cors");
const admin = require("firebase-admin");
admin.initializeApp();
const app = express();
app.use(cors({origin: true}));


app.post("/", async (req, res) => {
    const user = req.body;
    await admin.firestore().collection("users").add(user);
    res.status(201).send(JSON.stringify(user));
  }); 

The JSON data I posted was:

{"id":123, "name":"Tony Stark", "email":"ironMan@MarvelComics.com"}

In this get, the id is returned but I can't seem to access the other properties that are part of the record (example name: Tony Stark)?

  app.get("/:id", async (req, res) => {
    const snapshot = await
    admin.firestore().collection("users").doc(req.params.id).get();
    const userId = snapshot.id;
    const userData = snapshot.data():
    constole.log(userData);
    res.status(200).send(JSON.stringify({id: userId, ...userData}));
  });

There must be a simple solution but console.log(userData) is not the answer! :-(

Almost forgot to say, my request from the browser is passing the user id as a query parameter, in this example localhost:5001/projectReference/user/1 and I also tried with the Cloud Firestore document id (.../user/XRAwtfj9FSubeCArvUtQ). In each case I see in the browser the JSON string {"id":"the_value_requested"} but no userData.