FastAPI Beyond CRUD Part 4: Modular Project Structure With Routers

FastAPI is a high-performance web framework for building APIs with Python. In this article, we will explore how to create a modular project structure in FastAPI using routers.

What is a Router in FastAPI?

In FastAPI, a router is a way to organize your API endpoints into separate modules. Each router can handle a specific set of endpoints related to a particular resource or feature of your API.

Creating Routers in FastAPI

To create a router in FastAPI, you can use the APIRouter class provided by the framework. Here’s an example of how you can create a router for handling user-related endpoints:

        from fastapi import APIRouter
        
        router = APIRouter()
        
        @router.get("/users/")
        def get_users():
            return {"message": "Get all users"}
        
        @router.get("/users/{user_id}")
        def get_user(user_id: int):
            return {"message": f"Get user {user_id}"}
    

By creating a router for user-related endpoints, you can keep your codebase clean and organized by separating different parts of your API into their own modules.

Modular Project Structure with Routers

By using routers in FastAPI, you can create a modular project structure that makes it easy to add new features to your API and maintain existing code. Here’s an example of how you can create a modular project structure with routers:

1. Create a new folder for your routers, such as routers/.

2. In this folder, create separate Python files for each router, such as users.py for user-related endpoints and posts.py for post-related endpoints.

3. Define your routers in each file using the APIRouter class.

4. Import and include your routers in the main app.py file using the include_router method.

With this modular project structure, you can easily add new routers for different parts of your API without cluttering your main application file. This makes it easier to collaborate with other developers and maintain your codebase as it grows.

Conclusion

In this article, we’ve explored how to create a modular project structure in FastAPI using routers. By organizing your API endpoints into separate modules, you can keep your codebase clean and maintainable, making it easier to add new features and collaborate with other developers.

Stay tuned for more articles on FastAPI Beyond CRUD to learn how to build powerful APIs with Python!