First API request and response in Rest API - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this simple GET request?

Consider this HTTP GET request to a public API that returns JSON data about a user. What will be the output printed by the code?

Rest API

import requests
response = requests.get('https://jsonplaceholder.typicode.com/users/1')
print(response.json()['username'])

A "Bret"

B "Leanne"

C "User1"

D KeyError

💡 Hint

Look at the user data returned by the API for user with ID 1.

The API returns a JSON object for user 1, whose username is "Bret". Accessing the 'username' key prints "Bret".

🧠 Conceptual

intermediate

Which HTTP status code indicates a successful GET request?

When you make a GET request to an API and it succeeds, which HTTP status code do you usually get?

A 404

B 500

C 301

D 200

💡 Hint

Think about the code meaning: 200 means OK.

HTTP status code 200 means the request was successful and the server returned the requested data.

❓ Predict Output

advanced

What is the output of this POST request code?

This code sends a POST request to create a new post. What will be printed?

Rest API

import requests
url = 'https://jsonplaceholder.typicode.com/posts'
data = {'title': 'foo', 'body': 'bar', 'userId': 1}
response = requests.post(url, json=data)
print(response.json()['id'])

A 1010

B 101

C 102

D 201

💡 Hint

The API returns a new post with an id starting at 101.

The fake API returns a new post with id 101 for the created resource.

🔧 Debug

advanced

What error does this code raise?

This code tries to get a user but has a mistake. What error will it raise?

Rest API

import requests
response = requests.get('https://jsonplaceholder.typicode.com/users/9999')
print(response.json()['username'])

A KeyError

B IndexError

C TypeError

D No error, prints username

💡 Hint

User 9999 does not exist, so the JSON response is empty.

The API returns an empty object {} for user 9999. Accessing 'username' key raises KeyError.

🚀 Application

expert

How many items are in the list returned by this API call?

This code fetches all users. How many user objects are in the returned list?

Rest API

import requests
response = requests.get('https://jsonplaceholder.typicode.com/users')
users = response.json()
print(len(users))

A 5

B 20

C 10

D 0

💡 Hint

The API returns 10 users in the list.

The API returns a list of 10 user objects for the /users endpoint.