Route decorator syntax in FastAPI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the @app.get() decorator in FastAPI?

It defines a route that listens for HTTP GET requests at the specified path and links it to a function that handles those requests.

beginner

How do you specify the URL path for a route in FastAPI?

You pass the path as a string argument inside the route decorator, for example, @app.post('/items/') sets the route to '/items/'.

beginner

What HTTP methods can you use with FastAPI route decorators?

Common methods include @app.get(), @app.post(), @app.put(), @app.delete(), and @app.patch().

intermediate

How do you add a route that accepts any HTTP method in FastAPI?

Use the @app.api_route() decorator and specify the methods list, for example: @app.api_route('/path', methods=['GET', 'POST']).

beginner

What does the function decorated by a FastAPI route decorator return?

It returns the response data that FastAPI converts to JSON or another response format to send back to the client.

Which decorator would you use to create a route that handles HTTP POST requests in FastAPI?

A @app.get()

B @app.post()

C @app.put()

D @app.delete()

The @app.post() decorator is used to define routes that handle POST requests.

How do you define a route for the URL path '/users' that accepts GET requests?

A @app.get('/users')

B @app.post('/users')

C @app.route('/users')

D @app.api_route('/users')

The @app.get('/users') decorator sets a GET route for the '/users' path.

What is the correct way to create a route that accepts both GET and POST methods?

A @app.api_route('/path', methods=['GET', 'POST'])

B @app.get('/path', methods=['POST'])

C @app.post('/path', methods=['GET'])

D @app.route('/path')

The @app.api_route decorator allows specifying multiple HTTP methods.

What does the function decorated by a route decorator usually return?

A The URL path string

B The HTTP method name

C Response data to send back to the client

D Nothing

The function returns data that FastAPI sends as the HTTP response.

Which of these is NOT a valid FastAPI route decorator?

A @app.delete()

B @app.get()

C @app.put()

D @app.fetch()

@app.fetch() is not a valid FastAPI route decorator.

Explain how to create a GET route in FastAPI and what the decorated function should do.

Think about how you tell FastAPI what URL to listen to and what to send back.

Describe how to handle multiple HTTP methods for a single route in FastAPI.

Remember the decorator that lets you list methods.