Email authentication with firebase in nodejs

In this article i will explain you step by step how you can add email authentication with firebase in your nodejs application

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

Go to https://firebase.google.com 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: Create firebase credentials

Once your project created go to ProjectOverview->Project Settings and scroll below and click on Add App
Select Web option

firebase-add-app

Keep you credentials somewhere safe

firebase-credentials

Step 3: Enable email authentication from firebase

In order to enable email authentication from firebase

Go to Authentication from left panel of firebase
Go to sign-in method tab
Click on Add new provider
Select Email/Password and we are done

Step 4: Add firebase authentication code to firebase

Install firebase

Go to your node project folder and install firebase

npm install firebase

Copy paste the following code in your node js project and according to your node js project setup

import express from "express";
import path from "path";
import "dotenv/config";
import { initializeApp } from "firebase/app";
const app = express();
const port = 3000;
const __dirname = path.resolve();
const firebaseConfig = {
  apiKey: process.env.API_KEY,
  authDomain: process.env.AUTH_DOMAIN,
  databaseURL: process.env.DATABASE_URL,
  projectId: process.env.PROJECT_ID,
  storageBucket: process.env.STORAGE_BUCKET,
  messagingSenderId: process.env.MESSAGE_SENDER_ID,
  appId: process.env.APP_ID,
};
const firebase = initializeApp(firebaseConfig);

app.use(express.json());

app.use(express.static(path.join(__dirname, "src/public")));

app.get("/login", (req, res, next) => {
  res.sendFile(__dirname + "/src/public/index.html");
});

app.post("/signup", async (req, res, next) => {
  var email = req.body.email;
  var password = req.body.password;

  firebase
    .auth()
    .createUserWithEmailAndPassword(email, password)
    .then(function (userRecord) {
      console.log("User Created");
    })
    .catch(function (error) {
      console.log("Something went wrong");
    });
});

app.post("/authenticate", async (req, res, next) => {
  var email = req.body.email;
  var password = req.body.password;
  firebase
    .auth()
    .signInWithEmailAndPassword(email, password)
    .catch(function (error) {
      console.log(error.code);
      console.log(error.message);
    });
});

app.post("/logout", async (req, res, next) => {
  firebase
    .auth()
    .signOut()
    .then(
      function () {
        console.log("Logged out!");
      },
      function (error) {
        console.log(error.code);
        console.log(error.message);
      }
    );
});

app.listen(port, () => {
  console.log(`Demo app listening on port ${port}`);
});