How to Send One-Time Passwords (OTP) via SMS in Spring Boot

Here’s a Spring Boot application that sends an OTP to a mobile number using Twilio. Twilio is a cloud-based service for sending SMS messages.

Steps to Set Up the Project:

1. Create a Spring Boot Application (Using Spring Initializr or manually).

Dependencies:

• Spring Web
• Spring Boot Starter Mail (Optional, if email OTP needed)
• Twilio SDK

2. Get Twilio Credentials:

• Sign up on Twilio
• Get ACCOUNT_SID, AUTH_TOKEN, and TWILIO_PHONE_NUMBER

After generating project from https://start.spring.io/ :

Add Maven Dependencies in pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>3.4.2</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>…