DTOs & Validations in Spring Boot | Make Your REST API Professional | Spring Boot Full Course #16

In this video, we will learn one of the most important concepts in Spring Boot REST API development: DTOs and Validations. Till now, we were directly sending and receiving Entity objects in our API. But in real-world projects, this is not considered a good practice. That is where DTOs come in. In this lecture, we will understand why DTOs are needed, how to create request and response DTOs, how to protect our Entity class, and how to send clean API responses. We will also learn how to apply validations using annotations like @NotBlank, @NotNull, @Email, @Size, @Min, and more. By the end of this video, your Spring Boot API will look much more professional and production-ready. Topics covered in this video: Why not expose Entity directly in API What is a DTO in Spring Boot Request DTO vs Response DTO Creating DTO classes Mapping Entity to DTO Adding validations in Spring Boot Using @Valid with Request Body Common validation annotations Handling validation errors Building cleaner and professional API responses This is an important step before learning Global Exception Handling, ResponseEntity, and building production-level REST APIs. JAVA Beginner to Advance Series :    • Java Full Course 2026   Join System Design WhatsApp Group: https://www.whatsapp.com/channel/0029... Code and Notes: Github : https://github.com/adityatandon15/Spr... We have paid courses on DSA, Web Development , Blockchain, System Design & GenAI. Join Courses: https://strikes.in/ Coder Army Website: https://coderarmy.in/#home Coder Army App: https://play.google.com/store/apps/de... Connect with Aditya Tandon Instagram :   / adityatandon2   LinkedIn :   / adityatandon2   Twitter : https://x.com/adityatandon02 Timestamps: