Question

Technologies:

javascript

react-native

Tolerim

a day ago

How do I implement signup and login functionality using React-Native and firebase?

As I'm developing an Android app using React Native, I've created a signup page and I'm attempting to use Firebase to allow users to create an account and to login. The following is the code for my signup page:

import React from 'react';
import { View, StyleSheet, Alert } from 'react-native';
import { Button, TextInput } from 'react-native-paper';
import { getAuth, createUserWithEmailAndPassword } from "firebase/auth";
import app from './firebaseConfig';

const SignUpScreen = ({ navigation }) => {
  const [email, setEmail] = React.useState('');
  const [password, setPassword] = React.useState('');

  const signUp = async () => {
    const auth = getAuth(app);
    try {
      const userCredential = await createUserWithEmailAndPassword(auth, email, password);
      const user = userCredential.user;
      Alert.alert('Success', 'Account created successfully');
      navigation.navigate('Login');
    } catch (error) {
      const errorCode = error.code;
      const errorMessage = error.message;
      Alert.alert('Error', errorMessage);
    }
  };

  return (
    <View style={styles.container}>
      <TextInput
        label="Email"
        value={email}
        onChangeText={text => setEmail(text)}
      />
      <TextInput
        label="Password"
        value={password}
        onChangeText={text => setPassword(text)}
        secureTextEntry
      />
      <Button mode="contained" onPress={signUp}>
        Sign Up
      </Button>
      <Button onPress={() => navigation.navigate('Login')}>
        Already have an account? Log in
      </Button>
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    padding: 16,
  },
});

To implement Firebase functionality, I've also included the following code for firebaseConfig:

import { initializeApp } from "firebase/app";
import { getAnalytics } from "firebase/analytics";

const firebaseConfig = {
  apiKey: "MYAPIKEY",
  authDomain: "myapp.firebaseapp.com",
  projectId: "myapp",
  storageBucket: "myapp.appspot.com",
  messagingSenderId: "SenderID",
  appId: "appID",
  measurementId: "GoogleAnalytics Tag"
};

const app = initializeApp(firebaseConfig);
const analytics = getAnalytics(app);

However, when attempting to create an account, I'm receiving a console warning:

Possible Unhandled Promise Rejection (id: 2):
TypeError: Cannot read property 'getProvider' of undefined
TypeError: Cannot read property 'getProvider' of undefined

As a result, no users are being created. I'm not sure how to proceed from here and would appreciate any assistance.

Answers(1)

Accepted Answer

The error message "TypeError: Cannot read property 'getProvider' of undefined" is being caused because auth variable is not properly initialized with the app object. You can try console logging the app object to confirm if it is properly being initialized. You also want to ensure that you have initialized Firebase Auth in your Firebase console and enabled email authentication. Additionally, ensure that you have installed and are importing the latest version of firebase/auth in your project. You can do this by running npm install firebase and importing firebase/auth as import { getAuth, createUserWithEmailAndPassword } from "firebase/auth";.