# Implementing Email and Password Authentication in Flutter using Firebase | Flutter & Firebase

This is the beginning of Flutter and Firebase series. In this series, we’ll implement different Firebase services, one service at a time. For this article, we’ll see how to implement Firebase Authentication with email and password.

Let’s get started!

**Prerequisites:**

* Installed Flutter and Dart SDK,
    
* Android Studio / Visual Studio Code,
    
* Able to run the default Flutter app.
    

### **Step 1: Setup Firebase Project and add dependencies**

Follow the official Firebase documentation from [here](https://firebase.google.com/docs/flutter/setup) to setup Firebase in the project. Then, add the following i*n* `pubspec.yaml` —

```kotlin
dev_dependencies:

    flutter_test:

        sdk: flutter

    firebase_core:

    firebase_auth:
```

and do `flutter packages get`

Don’t forget to enable Email/Password Sign-in.

![Firebase Console- Authentication.](https://cdn.hashnode.com/res/hashnode/image/upload/v1621311732171/-gopVeXxO.png align="left")

*Firebase Console-> Authentication.*

### Step 2: Convert App to AndroidX

To make our app backward compatible, we need to enable androidX. To do so, follow the instructions [here](https://flutter.dev/docs/development/packages-and-plugins/androidx-compatibility).

### Step 3: Creating `TextFormFields` and Button

We’ll reuse the following code for creating both `Register` and `Login` interface —

```dart
Scaffold(
      body: Container(
        padding: EdgeInsets.all(16),
        child: Center(
            child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            TextFormField(
                controller: emailTC,
                decoration: InputDecoration(labelText: "Email")),
            TextFormField(
              controller: passwordTC,
              obscureText: true,
              decoration: InputDecoration(labelText: "Password"),
            ),
            FlatButton(
                child: Text("Submit"),
                textColor: Colors.white,
                color: Colors.blue,
                onPressed: () {
                  doSomething(emailTC.text, passwordTC.text);
                }),
          ],
        )),
      ),
    );
```

### Step 3: Implementing Register functionality

We’ll create a function named `register` to sign up users using email and password —

```kotlin
// Initializing Firebase Auth
final *FirebaseAuth* _auth = *FirebaseAuth*.instance;

// Defining Register function 
register(emailAddr, pass) {
_auth.createUserWithEmailAndPassword(email: emailAddr, password: pass)
.then((FirebaseUser user) => print(user))
.catchError((e) => print(e));
}
```

### Step 4: Implementing Login functionality

To implement login with email and password, we’ll create a login function —

```kotlin
// Initializing Firebase Auth
final *FirebaseAuth* _auth = *FirebaseAuth*.instance;

// Defining Login function
login(emailAddr, pass) {
_auth.signInWithEmailAndPassword(email: emailAddr, password: pass)
.then((FirebaseUser user) => print(user))
.catchError((e) => print(e));
}
```

You might get `PlatformException (PlatformException(error, Given String is empty or null, null)`, to handle that we used `.catchError()` method above. This can be referenced in this [issue](https://github.com/flutter/flutter/issues/27578).

Well, that all!

If you followed every step properly, the code will work flawlessly unless the Flutter developers decide to change any method implemented here.

All the functionalities above are implemented in [this repository](https://github.com/imabhishekkumar/Flutter-and-Firebase/tree/master/firebase_email_auth).