Phone OTP (SMS)

Phone OTP (One-Time Password) is an SMS-based authentication method that delivers a unique, time-limited numeric code to the user's mobile device for secure identity verification and two-factor authentication.

Let users sign in with a code instead of a password - one API alongside passkeys, magic links and social login. Phone OTP is on Business Pro and Enterprise.

Get started for free Live demo

Key Features

Secure and reliable SMS-based one-time passwords

Secure OTP Generation

Cryptographically secure, time-limited one-time passwords

Global SMS Delivery

95% of codes delivered in under 3 seconds, to mobile phones worldwide

Customizable SMS Templates

Brand the SMS messages to match your company identity

Configurable Expiry Times

Set custom expiration times for enhanced security

Rate Limiting

Built-in protection against brute force attacks

Comprehensive Analytics

Detailed insights into OTP usage and success rates

How Phone OTP Works

A simple, secure authentication flow for your users

Request
User enters their phone number on your login page
Delivery
User receives an SMS with a secure, time-limited OTP code
Verification
User enters the OTP code to complete authentication

Simple Integration

Implementing Phone OTP with MojoAuth is straightforward. Our SDKs handle the complexity, so you can focus on building your application.

Deploy in hours, not months
Customizable SMS templates
Secure OTP generation and validation
Comprehensive analytics and reporting

View implementation guide

index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>MojoAuth Passwordless Login</title>
  <script src="https://cdn.mojoauth.com/js/mojoauth.min.js" charset="UTF-8"></script>

</head>
<body>

  <h1>Login with MojoAuth</h1>
  <div id="mojoauth-passwordless-form"></div>

  <script>
    // Initialize MojoAuth instance
    const mojoauth = new MojoAuth("YOUR_MOJOAUTH_API_KEY", {
      language: 'en',  // Replace 'en' with your preferred language code if needed
      redirect_url: "https://yourwebsite.com/callback",  // Replace with your redirect URL after login
      source: [
        { type: "phone", feature: "otp" }
      ]
    });

    // Trigger sign-in flow
    mojoauth.signIn().then(response => {
      console.log("Login Response:", response);

      // Example: Redirect after successful login
      if (response && response.access_token) {
        window.location.href = "/dashboard";  // Replace with your post-login page
      }
    }).catch(error => {
      console.error("Authentication Error:", error);
    });
  </script>

</body>
</html><!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>MojoAuth Passwordless Login</title>
  <script src="https://cdn.mojoauth.com/js/mojoauth.min.js" charset="UTF-8"></script>

</head>
<body>

  <h1>Login with MojoAuth</h1>
  <div id="mojoauth-passwordless-form"></div>

  <script>
    // Initialize MojoAuth instance
    const mojoauth = new MojoAuth("YOUR_MOJOAUTH_API_KEY", {
      language: 'en',  // Replace 'en' with your preferred language code if needed
      redirect_url: "https://yourwebsite.com/callback",  // Replace with your redirect URL after login
      source: [
        { type: "phone", feature: "otp" }
      ]
    });

    // Trigger sign-in flow
    mojoauth.signIn().then(response => {
      console.log("Login Response:", response);

      // Example: Redirect after successful login
      if (response && response.access_token) {
        window.location.href = "/dashboard";  // Replace with your post-login page
      }
    }).catch(error => {
      console.error("Authentication Error:", error);
    });
  </script>

</body>
</html>

Benefits of Phone OTP

Why businesses and users choose phone OTP authentication

For Businesses

Reduced account takeover fraud
Enhanced security with time-limited codes
Higher conversion rates with mobile verification
Global reach with SMS delivery
Deploy in hours, not months
Detailed analytics on authentication patterns

For Users

No passwords to remember
Familiar SMS-based workflow
Enhanced security for sensitive accounts
Works on any mobile phone
Simple verification process
Reduced risk of credential theft

Works with every other method on the same API

Offer Phone OTP alongside passkeys, magic links, email OTP, social login and One Tap from one integration - and fall back between them when a code doesn't arrive.

See every authentication method

Ready to implement Phone OTP?

Fewer lost signups, no passwords to reset - Phone OTP on the same API as every other passwordless method.

Get started for free

Call +1-844-321-AUTH