APIRouter for modular routes in FastAPI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is APIRouter in FastAPI?

APIRouter is a tool in FastAPI that helps you organize your routes into smaller, manageable groups. It lets you split your app into parts, like chapters in a book, making your code cleaner and easier to understand.

beginner

How do you create a new router using APIRouter?

You create a new router by importing APIRouter from FastAPI and then making an instance like this: router = APIRouter(). After that, you add routes to this router instead of the main app.

beginner

Why use APIRouter instead of adding all routes directly to the FastAPI app?

Using APIRouter helps keep your code organized, especially when your app grows bigger. It allows you to group related routes together, making it easier to maintain and test parts of your app separately.

beginner

How do you include an APIRouter in the main FastAPI app?

After creating a router, you add it to the main app using app.include_router(router, prefix='/path'). The prefix adds a common path to all routes in that router.

intermediate

Can APIRouter have its own dependencies and tags?

Yes! You can set dependencies, tags, and other options on an APIRouter. This means all routes in that router share those settings, which saves you from repeating code.

What does APIRouter help you do in FastAPI?

A Style your web pages

B Organize routes into groups

C Create database models

D Manage user sessions

APIRouter is used to organize routes into groups for better code structure.

How do you add a router to the main FastAPI app?

A app.add_router(router)

B app.attach_router(router)

C app.register_router(router)

D app.include_router(router)

The correct method is app.include_router(router).

What is the purpose of the prefix parameter in include_router?

A To set the router's name

B To define the router's dependencies

C To add a common path before all routes in the router

D To specify the router's tags

The prefix adds a common path before all routes in the router.

Can you assign tags to an APIRouter?

A Yes, tags can be set for the whole router

B No, tags are only for individual routes

C Only if you use a special decorator

D Tags are not used in FastAPI

Tags can be assigned to the whole router to group routes in documentation.

Which import is needed to use APIRouter?

A from fastapi import APIRouter

B from fastapi import Router

C from fastapi.routing import APIRouter

D from fastapi import Route

You import APIRouter directly from fastapi.

Explain how APIRouter helps organize routes in a FastAPI app and how to include it in the main app.

Think of APIRouter as a way to split your app into smaller parts.

Describe how you can use dependencies and tags with APIRouter to simplify your FastAPI code.

Consider how grouping routes can also group their settings.