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Explanation

Overview of Login & Register API 🔐 A Register API stores new user details in the database, while a Login API verifies user credentials (email and password). These APIs are commonly implemented using Spring Boot, Spring Data JPA, and REST controllers for secure authentication workflows.

Code:

// Base URL Example
POST /auth/register
POST /auth/login

Explanation

Slide 2: User Entity Creation 🧑‍💻 The User entity represents the database table structure. It contains fields like id, name, email, and password. Spring Boot maps this class to a database table using JPA annotations.

Code:

@Entity
public class User {

 @Id
 @GeneratedValue(strategy =
 GenerationType.IDENTITY)
 private Long id;
 private String name;
 private String email;
 private String password;
}

Explanation

Slide 3: Register API Implementation 📦 The Register API saves new user details into the database using JpaRepository. This allows automatic CRUD operations without writing SQL queries.

Code:

@PostMapping("/register")
public ResponseEntity<User> 
register(@RequestBody User user) {
 return ResponseEntity.ok(
userRepository.save(user));
}

Explanation

Slide 4: Login API Implementation 🚀 The Login API verifies whether the provided email exists and checks if the password matches. If valid, it returns success; otherwise, it returns an error message.

Code:

Optional<User> existingUser = 
userRepository.findByEmail(user.getEmail());

 if(existingUser.isPresent() &&
 existingUser.get().getPassword().
equals(user.getPassword())) {
  return ResponseEntity.ok(
"Login Successful");
 }
 return ResponseEntity.status(401)
.body("Invalid Credentials");