Deploying/Testing functions with Firebase Cloud Functions

Question

I'm following This tutorial, trying to deploy some functions to Firebase, and I can successfully deploy them to my project id. When accessing the following function on the provided URL, I get the error: could not handle the request

// The Cloud Functions for Firebase SDK to create Cloud Functions and setup 
triggers.
const functions = require('firebase-functions');

// The Firebase Admin SDK to access the Firebase Realtime Database. 
const admin = require ('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.date = functions.https.onRequest((req, res) => {
let format = req.query.format;
const date = moment().format();
res.status(200).json({ date: date});
})

My Firebase console logs this on execution:

ReferenceError: moment is not defined
at exports.date.functions.https.onRequest (/user_code/index.js:10:24)
at cloudFunction (/user_code/node_modules/firebase-
functions/lib/providers/https.js:26:41)
at /var/tmp/worker/worker.js:635:7
at /var/tmp/worker/worker.js:619:9
at _combinedTickCallback (internal/process/next_tick.js:73:7)
at process._tickDomainCallback (internal/process/next_tick.js:128:9)

My package.json in my functions folder has "moment": "^2.19.1" under dependencies.

What am I doing wrong? How do I define moment?

Frank van Puffelen · Accepted Answer · 2017-10-15 14:02:14Z

6

Having moment.js defined in your package.json only means that it'll be installed in the environment where your code runs. To have it available in your code, you need to import the moment library:

const functions = require('firebase-functions');
const moment = require('moment');

const admin = require ('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.date = functions.https.onRequest((req, res) => {
  let format = req.query.format;
  const date = moment().format();
  res.status(200).json({ date: date});
})

Also see the moment.js docs for using it in node.js.

answered Oct 15, 2017 at 14:02

Frank van Puffelen

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