Expense Tracker (Spring Boot)

Simple REST API built using Spring Boot, Spring Data JPA, and PostgreSQL.

Features

• CRUD operations for expenses
• Get expense by ID
• Get total expense count
• Get total amount grouped by category

Tech Stack

• Java
• Spring Boot
• Spring Data JPA
• PostgreSQL

Project Structure

• src/main/java/com/prac/practice
  • controller
  • service
  • repository
  • entity
• PracticeApplication.java

How to Run Locally

1. Clone the repository
2. Create PostgreSQL database named expense_db
3. Update credentials in application.properties
4. Mainly password from application.properties
5. Run the application with: mvn spring-boot:run

• Base URL: http://localhost:8080/expenses

API Endpoints (Test using Postman)

The following operations can be tested using Postman.

Method	Endpoint	Purpose
POST	/expenses	Create an expense
GET	/expenses	Get all expenses
GET	/expenses/id/{id}	Get expense by ID
PUT	/expenses/id/{id}	Update an expense
DELETE	/expenses/id/{id}	Delete an expense
GET	/expenses/count	Get total number of expenses
GET	/expenses/total-by-category	Get total amount grouped by category

Sample JSON

{ "title": "Coffee", "category": "Food", "amount": 120 }