🚀 Java Spring REST API: 11 Best Practices with Code Examples 🌱

Building clean, scalable, and secure REST APIs with Spring Boot is all about following solid architecture and best practices. Here are 11 tips you use in every project:

1️⃣ Use Plural Nouns in Endpoints

// good
@RequestMapping("/products")

// avoid
@RequestMapping("/product")        

2️⃣ Avoid Redundant Paths in POST

// good
@PostMapping
public ResponseEntity<Void> create(@RequestBody ProductDTO dto) { ... }

// avoid
@PostMapping("/create-product")        

3️⃣ Return Proper HTTP Status Codes

return ResponseEntity.status(HttpStatus.CREATED).build(); // 201        

4️⃣ Use DTOs with record, Not Entities

public record ProductDTO(String name, BigDecimal price) {}

🚫 Don’t expose JPA entities in your API.        

5️⃣ Validate Input with Bean Validation

public record ProductDTO(
  @NotBlank String name,
  @Positive BigDecimal price
) {}


@PostMapping
public ResponseEntity<Void> create(@Valid @RequestBody ProductDTO dto) { ... }
        

6️⃣ Follow Layered Architecture

• ProductController: Handles HTTP
• ProductService: Business Logic
• ProductRepository: Data Access

7️⃣ Support Pagination

@GetMapping
public Page<ProductDTO> list(Pageable pageable) { ... }        

8️⃣ Global Exception Handling

@ControllerAdvice
public class GlobalExceptionHandler {
  @ExceptionHandler(MethodArgumentNotValidException.class)
  public ResponseEntity<?> handleValidationErrors(...) { ... }
}        

9️⃣ API Versioning

@RequestMapping("/api/v1/products")        

🔟 Document with Swagger

@Operation(summary = "Create a new product")

// Use Springdoc OpenAPI for easy integration.        

1️⃣1️⃣ Secure Your Endpoints

PreAuthorize("hasRole('ADMIN')")

// Use Spring Security with JWT or OAuth2.        

These practices help you write clean, maintainable, and production-ready APIs. Which one do you use the most?

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Would you like me to update the banner to reflect these code-based best practices too?