How do you secure a REST API in Spring Boot?

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Securing a REST API in Spring Boot requires multiple strategies to protect data and ensure only authorized users access resources. The most common approach is integrating Spring Security. First, enable authentication (verifying user identity) using methods like Basic Auth, JWT (JSON Web Tokens), or OAuth2. JWT is widely used since it’s stateless and scalable for microservices. Next, configure authorization to control access based on roles or permissions, using annotations like @PreAuthorize("hasRole('ADMIN')"). Always serve APIs over HTTPS to encrypt traffic and prevent man-in-the-middle attacks. Disable CSRF for stateless APIs but properly configure CORS to allow only trusted domains. Add rate limiting and throttling via API gateways to prevent abuse. Validate and sanitize inputs to defend against injection attacks. Implement proper exception handling and logging without exposing sensitive details. Together, these measures—Spring Security with JWT/OAuth2, TLS, validation, and gateway protections—create a strong security layer for Spring Boot REST APIs.
         

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