This content originally appeared on DEV Community and was authored by Muha-mmed
When learning backend development, one of the best ways to practice is by building something practical and relatable. For me, that turned out to be a Bank App API — a Spring Boot project where users can create accounts, deposit and withdraw money, check balances, and even close accounts.
This project gave me hands-on experience with Spring Boot, Spring Data JPA, and REST API design, while also teaching me how to think about real-world requirements like account numbers and user authentication.
🛠 Tech Stack
Spring Boot – for building the REST API.
Spring Data JPA – for interacting with the database.
Maven – build and dependency management.
Database – works with relational databases like MySQL (but could also run on H2 for testing).
📌 Features Implemented
The application exposes endpoints under /account. Here’s what you can do:
Create an account
POST /account – Add a new account to the system.
Get account by account number
GET /account/{accountNumber} – Fetch details for a specific account.
Get all accounts
GET /account – Retrieve all stored accounts.
Deposit money
PUT /account/deposit/{accountNumber}/{amount} – Increase the account balance.
Withdraw money
PUT /account/withdraw/{accountNumber}/{amount} – Deduct from the account balance.
Close an account
DELETE /account/delete/{id} – Remove an account from the system.
Here’s a snippet from the controller:
public class AccountController {
@Autowired
AccountService service;
@PostMapping
public ResponseEntity<Account> createAccount(@RequestBody Account account){
Account createAccount =service.createAccount(account);
return ResponseEntity.status(HttpStatus.CREATED).body(createAccount);
}
@GetMapping("/{accountNumber}")
public Account getAccountDetailsByAccountNumber(@PathVariable Long accountNumber) {
Account getAccountDetail = service.getAccountDetailsByAccountNumber(accountNumber);
return getAccountDetail;
}
@GetMapping
public List<Account> getAllAccountDetails() {
List<Account> getAccountDetail = service.getAllAccountDetails();
return getAccountDetail;
}
@PutMapping("/deposit/{accountNumber}/{amount}")
public Account depositAmount(@PathVariable Long accountNumber,@PathVariable Double amount){
Account account = service.depositAmount(accountNumber,amount);
return account;
}
@PutMapping("/withdraw/{accountNumber}/{amount}")
public Account withdrawAmount(@PathVariable Long accountNumber,@PathVariable Double amount){
Account account = service.withdrawAmount(accountNumber,amount);
return account;
}
@DeleteMapping("/delete/{accountNumber}")
public ResponseEntity<String> closeAccount(@PathVariable Long accountNumber){
return ResponseEntity.status(HttpStatus.NO_CONTENT).body(service.closeAccount(accountNumber));
}
}
⚡ Challenges & Learning
Building this project gave me valuable practice with:
Structuring a Spring Boot project with controllers, services, and repositories.
Working with Spring Data JPA to simplify database operations.
Designing clean and RESTful API endpoints.
Testing endpoints using Postman.
I also realized how important it is to think ahead about real-world requirements. For example, account numbers should be standardized (e.g., 10-digit numbers) and authentication is needed to secure operations like deposit and withdrawal.
🔮 Future Improvements
This project is still growing, and here’s what I plan to add next:
Unique 10-digit account numbers (instead of relying on auto-generated IDs).
Login and Signup functionality, powered by Spring Security.
Improved error handling and validation (e.g., prevent overdrawing).
Transaction history and account statements.
🎯 Conclusion
The Bank App project may be simple, but it demonstrates core backend concepts:
Building REST APIs with Spring Boot.
Using JPA for database operations.
Structuring an application into layered components.
It’s a solid step in my Spring Boot journey, and I plan to keep improving it as I learn more about authentication, security, and production deployment.
🔗 Check it out on GitHub: Bank-App-Spring-Boot
This content originally appeared on DEV Community and was authored by Muha-mmed
Muha-mmed | Sciencx (2025-09-19T12:12:39+00:00) Building a Simple Bank App API with Spring Boot and Spring Data JPA. Retrieved from https://www.scien.cx/2025/09/19/building-a-simple-bank-app-api-with-spring-boot-and-spring-data-jpa-2/
Please log in to upload a file.
There are no updates yet.
Click the Upload button above to add an update.