Spring Boot REST API Input Validation: Techniques You NEED to Know

Stop bad data in your Spring Boot REST API! Learn input validation step-by-step & ensure data integrity (2025).

💻 Stop bad data from entering your database by implementing robust validation rules in your Java backend.

🛠️ In this crucial tutorial, you will learn how to:

* ❓ Understand why input validation is critical for any real-world API.
* ➕ Add the spring-boot-starter-validation dependency to your pom.xml.
* ✍️ Apply standard Bean Validation annotations (like @NotBlank, @Size, @Min) to your JPA Entities.
* ✅ Use the @Valid annotation in your REST Controller to trigger validation checks on incoming data.
* 💥 Implement a controller-specific ExceptionHandler to catch MethodArgumentNotValidException.
* 💬 Return clean, structured, and user-friendly custom error messages when validation fails.
* 👀 See the limitations of local handlers and understand why a global solution is often needed.

💻 Technologies Covered:
* Java ☕
* Spring Boot (Validation, Web, Data JPA) 🌱
* Jakarta Bean Validation API
* Postman 📮

🧑‍💻 Who is this tutorial for?

* Developers wanting to make their Spring Boot APIs more robust and secure.
* Anyone needing to implement server-side input validation.
* Programmers looking for practical error handling techniques.
* Viewers following our Spring Boot CRUD API series. 🎓

💡 What's Next?
We demonstrate how a local ExceptionHandler works, but imagine adding that to every controller! It's not ideal.
➡️ In our next video, we'll build a powerful Global Exception Handler – the professional way to manage validation (and other) errors consistently across your entire Spring Boot application! Subscribe 🔔 so you don't miss it!

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