how to send firebase authentication otp using nodejs

To send Firebase authentication OTP using Node.js, you can use the Firebase Admin SDK, which provides programmatic access to Firebase services.

Here are the steps to send Firebase authentication OTP using Node.js:

1. Set up a Firebase project and enable the Firebase Authentication service. You can follow the instructions in the Firebase documentation to create a new Firebase project and enable Firebase Authentication.

2. Install the Firebase Admin SDK in your Node.js project. You can do this by running the following command in your terminal:

    npm install firebase-admin
   

3. Initialize the Firebase Admin SDK with your Firebase project credentials. You can obtain your Firebase project credentials from the Firebase console.

    const admin = require('firebase-admin');
   
    const serviceAccount = require('/path/to/serviceAccountKey.json');
   
    admin.initializeApp({
      credential: admin.credential.cert(serviceAccount),
    });
   

4. Create a function that sends an OTP code to the user's phone number. This function will use Firebase's auth().createUser() method to create a new user with the specified phone number and send an OTP code to that number.

    const sendOTP = async (phoneNumber) => {
      try {
        const user = await admin.auth().createUser({
          phoneNumber: phoneNumber,
        });
        console.log(`OTP sent to ${phoneNumber}: ${user.toJSON().uid}`);
      } catch (error) {
        console.log(error);
      }
    };
   

   In this example, phoneNumber is the user's phone number, and the uid of the newly created user is logged to the console.

5. Call the sendOTP() function to send an OTP code to the user's phone number.

That's it! With these steps, you should be able to send Firebase authentication OTP using Node.js. Once the user enters the code in your app, you can use the Firebase client SDK to verify the code and log the user in.