How to create, deploy and work with firebase function

April 06, 2022

In this article iam gonna explain you how you can create firebase function, deploy and work with firebase function

Step 1: Create a Firebase Project or you can skip this step of you have already created your firebase project

  • Go to and click on Get Started

  • Proceed to click on Create a project.

  • Enter a project name and check yes if you wish to add analytics to your project.

  • Wait for the project to be created.

Step 2 Install firebase tools and initialize firebase function

  • Run below command to install firebase tools globally
npm install -g firebase-tools
  • Initialize firebase function
firebase login
firebase init
  • Select Functions option in below step
$ firebase init
> ? Which Firebase features do you want to set up for this directory? Press Space to select features, then Enter to confirm your choices
. (Press <space> to select, <a> to toggle all, <i> to invert selection, and <enter> to proceed)
❯◯ Realtime Database: Configure a security rules file for Realtime Database and (optionally) provision default instance
 ◯ Firestore: Configure security rules and indexes files for Firestore
 ◯ Functions: Configure a Cloud Functions directory and its files
 ◯ Hosting: Configure files for Firebase Hosting and (optionally) set up GitHub Action deploys
 ◯ Hosting: Set up GitHub Action deploys
 ◯ Storage: Configure a security rules file for Cloud Storage
 ◯ Emulators: Set up local emulators for Firebase products
(Move up and down to reveal more choices)
  • Select Language
? What language would you like to use to write Cloud Functions? (Use arrow keys)
❯ JavaScript
  • Install packages
? What language would you like to use to write Cloud Functions? JavaScript
? Do you want to use ESLint to catch probable bugs and enforce style? No
✔ Wrote functions/package.json
✔ Wrote functions/index.js
✔ Wrote functions/.gitignore
? Do you want to install dependencies with npm now? (Y/n) Yes

Step 3 Write your function inside functions/index.js file and deploy

Once function initialized and created you will see a folder functions and inside that folder you will have a main file named as index.js where you can define your function

A example function has already been created for you just un comment that

const functions = require("firebase-functions");

// // Create and Deploy Your First Cloud Functions
// //
exports.helloWorld = functions.https.onRequest((request, response) => {"Hello logs!", { structuredData: true });
  response.send("Hello from Firebase!");
  • Deploy your function using below command
firebase deploy --only functions
  • Once deployed you can access the function just replace the project id with your firebase project id