Complete Guide to Creating a Save Expense API with Validations in Spring Boot
🚀 In this video, we’ll walk through the complete process of building a Save Expense API using best practices — including DTO creation, input validation, and global exception handling in Spring Boot!
You’ll learn:
✅ How to use DTOs (Data Transfer Objects) to structure incoming API requests
✅ How to add validation rules for fields like expenseType, accountCategory, amount, and date
✅ How to handle missing or invalid inputs using @JsonProperty, validation annotations, and utility functions
✅ How to implement a global exception handler using @ControllerAdvice to return clean, meaningful error messages
📬 Whether you're building a financial tracking app or just want to improve your backend API quality, this tutorial will help you write clean, maintainable, and production-ready code.
Chapters
00:00 – Intro
00:50 – Objective
01:50 – App Setup
02:20 – Hello World API
03:45 – Display Request
04:57 – Validation for Input
08:47 – Spring Boot Advice Integration
10:41 – Outro