Explore Firebase's unified development platform; gain insights into authentication, Firestore, Cloud Functions, and deployment with CLI. Delve into hands-on web application creation and comprehensive tools.

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Firebase lesson

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Firebase is a unified application development platform to create, deploy, and monitor web and mobile experiences. It unites common product functions in a single platform, freeing engineers to create functionality and user experience rather than having to create the infrastructure.

This course is a comprehensive introduction to the Firebase 9 SDK through hands-on development of a web application. You’ll start with basic concepts and functions like authentication, database, and Cloud Storage with Firestore. You’ll then learn Cloud Functions for Firebase, environment variables, Security Rules, and hosting capabilities before deploying an application using the command line interface (CLI). At each step, you’ll get hands-on exercises to modify the code, see real-time output in your browser, and finish with an assessment.

By the end of this course, you’ll have all the tools you need to build and deploy a web application with the Firebase 9 SDK—the latest version of Firebase.

A Complete Guide to Firebase on the Web

**Cloud Functions** for Firebase is a Google Cloud product that lets us automatically run back-end code in response to events triggered either by other Firebase services or by HTTPS requests. With Cloud Functions, we can easily run server-side code without the need to set up a server. Some possible examples of this server-side code include adding roles to users, reacting to changes in a database, or notifying the user when something interesting—such as sending a welcome email when a user signs up—happens. These are events we typically won’t want to run on the client side. Therefore, a perfect use case for Cloud Functions. With the Admin SDK, we can seamlessly interact with other Firebase services from trusted environments via Cloud Functions. For example, we can create a new document in a Cloud Firestore `users` collection when a user signs up.

# How it works
Cloud Functions for Firebase is written in a Node.js environment using either JavaScript or TypeScript. After successfully writing a function, all functions must be deployed to the Cloud Functions runtime before usage. When deploying a function, the Firebase CLI takes all the code associated with that function and puts each function in separate containers and converts a function according to the requirements of Google servers. This allows Google servers to manage the function.

Cloud Functions can either be fired directly with an HTTP request or triggered in response to an event. When this happens, Cloud Functions spins up a server instance for the function in the cloud that activates and runs the function in response to these triggers. Cloud Functions then monitors this function and ensures that the instance created remains active until its promise resolves. As our application usage increases or decreases, Google responds by automatically scaling the server instances needed to run these functions.

>  **Note:** Firebase projects must have billing enabled to deploy a Cloud Function. This means all projects must be on the [Blaze plan](https://firebase.google.com/pricing) for us to use Cloud Functions. However, Firebase has a generous free tier that allows up to two million function invocations per month. Therefore, simple test applications such as ours probably do not need to worry about exceeding this limit. Check out the [Firebase website](https://firebase.google.com/pricing) to learn more.

To enable billing on a project, we perform the following steps:
1. Head over to the Firebase project dashboard.
2. Click the “Spark plan” button to show the billing plans.
3. Click the "Select plan" button under the "Blaze" plan section.
4. Next, set up a billing budget for the project by entering a value in the provided field. This allows Firebase to alert the project administrators whenever the project costs approach or exceed this amount.



Get a brief introduction to Cloud Functions for Firebase.

Introduction

Get Started with Firebase

Firebase Authentication

The Firebase Realtime Database

Cloud Firestore

Cloud Storage for Firebase

The Firebase CLI

Cloud Functions

Environment Variables in Firebase

Firebase Security Rules

Firebase Hosting

Firebase Assessment

Conclusion

Appendix

Introduction to Cloud Functions