Axios library in React Native - Build, Publish & Deploy

Build & Publish - Axios library

Performance Impact of Axios Library

Using Axios in a React Native app affects network performance. Axios handles HTTP requests asynchronously, so it does not block the UI thread, helping keep the app responsive. However, frequent or large data requests can increase memory use and battery drain. Axios itself is lightweight, but large JSON responses or many simultaneous requests can slow rendering and reduce frame rates below the smooth 60fps target.

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How to Optimize Axios Usage for 60fps Rendering

• Limit the number of simultaneous requests to avoid blocking the JS thread.
• Use Axios interceptors to cache responses and reduce repeated network calls.
• Request only necessary data fields to reduce payload size.
• Use pagination or lazy loading to fetch data in smaller chunks.
• Cancel unnecessary requests when components unmount to save resources.

Impact on App Bundle Size and Startup Time

Axios adds about 15-20KB minified to the app bundle, which is small compared to the total app size. It does not significantly affect startup time because it loads only when used. However, importing Axios globally without code splitting can slightly increase initial bundle size. Using the native fetch API instead can reduce bundle size but requires more manual setup.

iOS vs Android Differences for Axios Library

Axios works the same on iOS and Android in React Native because it uses JavaScript networking APIs under the hood. However, network security settings differ: iOS requires App Transport Security (ATS) compliance, so HTTP requests must use HTTPS or have exceptions configured. Android requires proper internet permissions in the manifest. Axios error handling may differ slightly due to platform network stack differences.

Relevant Store Review Guidelines and Requirements

• Apple App Store: Ensure all network requests use secure HTTPS endpoints to comply with ATS rules.
• Google Play Store: Declare internet permission in AndroidManifest.xml for network access.
• Handle user data securely and respect privacy policies when sending or receiving data.
• Do not perform excessive background network calls that drain battery or data without user consent.

Self-Check: Your App Takes 5 Seconds to Load This Screen. What's Likely Wrong?

Likely causes include Axios requests fetching large data asynchronously without showing a loading state, causing UI delay. Another issue could be multiple simultaneous Axios calls blocking the JS thread. Also, not cancelling obsolete requests or fetching unnecessary data can slow loading. Optimizing request size, caching, and asynchronous handling can improve load time.

Key Result

Axios is a lightweight HTTP client that helps manage network requests efficiently in React Native apps. Proper use ensures smooth 60fps UI, minimal memory impact, and compliance with app store network security rules.

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