Introduction

In this tutorial, we will provide an in-depth introduction to Firebase Authentication. Firebase Authentication is a cloud service that provides authentication services for applications without requiring a server. It offers different methods of authentication, such as email and password authentication, phone number authentication, and social authentication, etc.

By the end of this tutorial, you will be able to set up and configure Firebase Authentication in your HTML-based web application.

Prerequisites:

• Basic knowledge of HTML, CSS, and JavaScript.
• A Google account to access Firebase.

Step-by-Step Guide

1. Creating a Firebase Project:

Start by creating a new project on the Firebase platform. Go to the Firebase console (https://console.firebase.google.com/), sign in with your Google account, click on "Add project", then follow the on-screen instructions.

1. Adding Firebase to your web app:

After creating your Firebase project, you need to connect it to your web application. In your Firebase project dashboard, click on the "" icon to add Firebase to your web app. An overlay will appear with your Firebase SDK snippet. Copy this snippet.

1. Installing Firebase:

In your project directory, install firebase using npm (Node package manager). If you do not have npm installed, you can download it from https://nodejs.org/. Run the following command to install firebase:

bash npm install --save firebase

1. Configuring Firebase Authentication:

Navigate to the Authentication section in your Firebase project dashboard, and enable the sign-in method you want to use.

Code Examples

1. Initializing Firebase in your web app:

Paste the Firebase SDK snippet you copied earlier into your HTML file. It should look similar to this:

```html

```

Make sure you replace the values with your actual Firebase project configuration.

1. Email and Password Authentication:

You can allow users to sign up using their email and password. Here's how to create a new user:

javascript firebase.auth().createUserWithEmailAndPassword(email, password) .then((userCredential) => { // The user is signed up var user = userCredential.user; }) .catch((error) => { // Error handling var errorCode = error.code; var errorMessage = error.message; });

The createUserWithEmailAndPassword function takes in an email and password, and creates a new user in Firebase.

Summary

In this tutorial, we introduced Firebase Authentication, guided you on how to set up and configure it in an HTML-based web application, and showed you how to create a new user using email and password authentication.

To further your learning, you can explore other sign-in methods provided by Firebase, such as Google Sign-In, Facebook Login, and Twitter Login. Firebase also provides other services such as Cloud Firestore for database and Firebase Storage for file storage.

Practice Exercises

1. Create a sign-in function:

Implement a function that allows users to sign in to your application using their email and password. Firebase provides a signInWithEmailAndPassword function that you can use.

1. Implement Google Sign-In:

Enable Google Sign-In in your Firebase project settings and implement it in your web app. Take a look at the Firebase documentation for a guide: https://firebase.google.com/docs/auth/web/google-signin.

Solutions

1. Sign-in function:

javascript firebase.auth().signInWithEmailAndPassword(email, password) .then((userCredential) => { // User is signed in var user = userCredential.user; }) .catch((error) => { // Error handling var errorCode = error.code; var errorMessage = error.message; });

1. Google Sign-In:

```javascript
var provider = new firebase.auth.GoogleAuthProvider();

firebase.auth().signInWithPopup(provider)
.then((result) => {
// User is signed in
var user = result.user;
}).catch((error) => {
// Error handling
var errorCode = error.code;
var errorMessage = error.message;
});
```

Remember, practice makes perfect. Keep experimenting with different Firebase services and build more complex applications. Happy coding!