If you have worked on Java or Spring Boot applications, you have probably spent time creating DTOs, request classes, response classes, and mapping logic over and over again.
At first, it looks simple. But as the codebase grows, DTO management can quickly become repetitive, time-consuming, and easy to get wrong. You may have multiple entities, different API response formats, validation requirements, and small changes that need to be repeated across several files.
That was the problem that led me to build DTOForge.
DTOForge is an open-source Java tool designed to simplify DTO generation for backend applications. The goal is straightforward: help Java developers reduce boilerplate code, generate cleaner DTO structures, and spend more time focusing on actual business logic.
Why DTO Generation Matters in Java Applications
In many Spring Boot applications, DTOs are used to separate internal data models from what the API exposes. This is a good practice because it improves security, maintainability, and flexibility.
However, manually creating DTOs can become stressful when:
- The application has many entities
- Request and response objects keep changing
- Developers need different DTOs for different use cases
- Mapping logic becomes repetitive
- The team wants to maintain clean API contracts
Tools like Lombok help reduce boilerplate inside classes, but they do not fully solve the problem of creating and organizing DTOs across a growing Java backend project.
What DTOForge Does
DTOForge helps generate DTO classes from existing Java models. Instead of manually creating DTO files every time, developers can use DTOForge to speed up the process and keep their codebase cleaner.
The project focuses on:
- Reducing repetitive DTO creation
- Improving developer productivity
- Supporting cleaner backend architecture
- Making Java API development faster
- Creating a foundation for future code generation workflows
How DTOForge Was Designed
I built DTOForge with simplicity and extensibility in mind.
The tool is designed to be lightweight, so it can fit into existing Java development workflows without forcing developers to change how they already build applications.
The structure also makes it easier to add more features later, such as:
- Custom DTO templates
- Maven plugin support
- Gradle plugin support
- CLI-based DTO generation
- Support for different DTO patterns
- More flexible field selection
This makes DTOForge more than just a small utility. It is a foundation for a broader developer tooling system around Java backend productivity.
Why I Built It
I enjoy building tools that make engineering work simpler.
In backend development, small repetitive tasks can slow teams down over time. DTO creation is one of those tasks. It may not look like a major issue at first, but in large systems, repetition affects speed, consistency, and maintainability.
DTOForge is my attempt to solve that problem in a practical way for Java developers.
It reflects a simple engineering principle: developers should spend less time writing repetitive code and more time designing reliable systems.
What I Learned from Building DTOForge
Building DTOForge helped me think more deeply about developer tooling, code generation, and clean architecture.
It also strengthened my understanding of how small tools can improve productivity in real-world engineering teams. A good developer tool does not need to be complex. It just needs to solve a clear problem well.
DTOForge is still evolving, and I plan to keep improving it with better documentation, more generation options, and smoother integration into Java workflows.
Conclusion
DTOForge is an open-source Java DTO generator built to help backend developers reduce boilerplate and streamline DTO creation in Spring Boot applications.
The project is part of my broader interest in building open-source tools that improve developer productivity and simplify backend development.
GitHub Repository: https://github.com/ojoilesanmi/dtoforge