Axios library in React Native - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import Axios in a React Native component.

React Native

import [1] from 'axios';

Drag options to blanks, or click blank then click option'

Aaxios

BAxios

Cfetch

Dhttp

Attempts:

3 left

💡 Hint

Common Mistakes

Using uppercase 'Axios' which is not the default import name.

Confusing Axios with fetch or http.

The Axios library is imported using the name axios by convention.

2fill in blank

medium

Complete the code to make a GET request to 'https://api.example.com/data' using Axios.

React Native

axios.[1]('https://api.example.com/data')
  .then(response => {
    console.log(response.data);
  });

Drag options to blanks, or click blank then click option'

Apost

Bget

Cfetch

Drequest

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'post' instead of 'get' for fetching data.

Using 'fetch' which is not an Axios method.

To fetch data, use the get method of Axios.

3fill in blank

hard

Fix the error in the Axios POST request to send JSON data.

React Native

axios.post('https://api.example.com/data', [1])
  .then(response => {
    console.log(response.data);
  });

Drag options to blanks, or click blank then click option'

A{name: 'John'}

BJSON.stringify({name: 'John'})

C'name=John'

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a JSON string instead of an object.

Passing null or a plain string.

Axios automatically converts JavaScript objects to JSON, so pass the object directly.

4fill in blank

hard

Fill both blanks to handle errors in an Axios GET request.

React Native

axios.get('https://api.example.com/data')
  .then(response => {
    console.log(response.data);
  })
  .[1](error => {
    console.[2](error.message);
  });

Drag options to blanks, or click blank then click option'

Acatch

Blog

Cerror

Dwarn

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'error' instead of 'catch' for error handling.

Using console.error or console.warn instead of console.log.

Use catch to handle errors and console.log to print the error message.

5fill in blank

hard

Fill all three blanks to create an Axios instance with a base URL and timeout.

React Native

const api = axios.[1]({
  baseURL: '[2]',
  [3]: 5000
});

Drag options to blanks, or click blank then click option'

Acreate

Btimeout

Chttps://api.example.com

Dget

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'get' instead of 'create' to make an instance.

Confusing 'timeout' with 'baseURL'.

Use axios.create to make an instance, set baseURL to the API address, and timeout to limit request time.

Practice

1. What is the main purpose of using the Axios library in a React Native app?

easy

A. To make HTTP requests to fetch or send data

B. To style components with CSS

C. To manage app navigation between screens

D. To store data locally on the device

Solution

1. Step 1: Understand Axios functionality

   Axios is a library designed to simplify making HTTP requests like GET and POST.

2. Step 2: Identify Axios use in React Native

   It helps fetch data from servers or send data to them, which is essential for dynamic apps.

3. Final Answer:

   To make HTTP requests to fetch or send data -> Option A

4. Quick Check:

   Axios = HTTP requests [OK]

Hint: Axios is for internet requests, not styling or navigation [OK]

Common Mistakes:

• Confusing Axios with styling libraries
• Thinking Axios manages navigation
• Assuming Axios stores data locally

2. Which of the following is the correct syntax to make a GET request using Axios in React Native?

easy

A. axios.fetch('https://api.example.com/data')

B. axios.get('https://api.example.com/data')

C. axios.post('https://api.example.com/data')

D. axios.request('https://api.example.com/data')

Solution

1. Step 1: Recall Axios GET method

   The correct method to fetch data is axios.get(url).

2. Step 2: Check other options

   axios.fetch is not a valid Axios method, axios.post sends data, and axios.request is more generic but requires config.

3. Final Answer:

   axios.get('https://api.example.com/data') -> Option B

4. Quick Check:

   GET request = axios.get() [OK]

Hint: Use axios.get() for fetching data [OK]

Common Mistakes:

• Using axios.fetch which does not exist
• Confusing get with post method
• Using axios.request without config object

3. What will be logged to the console after this Axios GET request succeeds?

axios.get('https://api.example.com/user')
  .then(response => console.log(response.data.name))
  .catch(error => console.log('Error'));

Assuming the server responds with { "name": "Alice" }.

medium

A. response

B. Error

C. Alice

D. undefined

Solution

1. Step 1: Understand Axios response structure

   Axios returns a response object where the actual data is inside response.data.

2. Step 2: Access the name property

   The code logs response.data.name, which is "Alice" from the server response.

3. Final Answer:

   Alice -> Option C

4. Quick Check:

   response.data.name = Alice [OK]

Hint: Access data via response.data in Axios [OK]

Common Mistakes:

• Logging response instead of response.data
• Expecting data directly without .data
• Not handling promise with then/catch

4. Identify the error in this Axios POST request code snippet:

axios.post('https://api.example.com/login',
  { username: 'user1', password: 'pass123' }
).then(response => {
  console.log('Login successful');
}).catch(error => {
  console.log('Login failed');
});

medium

A. No error, code is correct

B. Missing await keyword for async call

C. Incorrect URL format

D. POST data should be a string, not an object

Solution

1. Step 1: Review Axios POST syntax

   Axios.post takes URL and data object as parameters, which is correct here.

2. Step 2: Check for syntax or usage errors

   The code uses promise chaining with then/catch correctly; await is optional.

3. Final Answer:

   No error, code is correct -> Option A

4. Quick Check:

   Axios.post with object data is valid [OK]

Hint: Axios.post accepts object data without await [OK]

Common Mistakes:

• Thinking await is mandatory with then/catch
• Assuming data must be JSON stringified manually
• Confusing URL format with error

5. You want to fetch user data and show a loading message while waiting. Which code snippet correctly uses Axios with React Native hooks to handle loading and errors?

hard

A. const [loading, setLoading] = useState(false);
useEffect(() => {
axios.get('/user')
.then(() => setLoading(false))
.catch(() => setLoading(false));
}, []);

B. const [loading, setLoading] = useState(false);
useEffect(() => {
axios.get('/user')
.then(() => setLoading(true))
.catch(() => setLoading(false));
}, []);

C. const [loading, setLoading] = useState(true);
useEffect(() => {
setLoading(false);
axios.get('/user')
.then(() => setLoading(true))
.catch(() => setLoading(false));
}, []);

D. const [loading, setLoading] = useState(false);
useEffect(() => {
setLoading(true);
axios.get('/user')
.then(() => setLoading(false))
.catch(() => setLoading(false));
}, []);

Solution

1. Step 1: Initialize loading state correctly

   Loading should start as false, then set to true when request starts.

2. Step 2: Set loading true before Axios call and false after response or error

   This ensures UI shows loading while waiting and hides it after.

3. Final Answer:

   Initialize loading false, set true before request, false after -> Option D

4. Quick Check:

   Loading true during request = const [loading, setLoading] = useState(false); useEffect(() => { setLoading(true); axios.get('/user') .then(() => setLoading(false)) .catch(() => setLoading(false)); }, []); [OK]

Hint: Set loading true before request, false after response [OK]

Common Mistakes:

• Starting loading as true but not setting it properly
• Setting loading true after request finishes
• Not handling loading state at all