Error handling in async/await in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to catch errors in an async function using try/catch.

Node.js

async function fetchData() {
  try {
    const response = await fetch('https://api.example.com/data');
    const data = await response.json();
    return data;
  } catch ([1]) {
    console.error('Error:', error);
  }
}

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

Aerror

Berr

Cexception

De

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name in catch that doesn't match the one used inside the block.

The catch block receives the error object. Naming it error is common and matches the usage inside the block.

2fill in blank

medium

Complete the code to rethrow an error after logging it in an async function.

Node.js

async function getUser() {
  try {
    const user = await fetchUserFromDB();
    return user;
  } catch ([1]) {
    console.error('Failed to get user:', err);
    throw err;
  }
}

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

Aerr

Berror

Ce

Dexception

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different variable name in catch than inside the block.

The catch block uses err to log and rethrow the error, so the variable name must be err.

3fill in blank

hard

Fix the error in the async function to properly handle errors with try/catch.

Node.js

async function loadData() {
  try {
    const result = await fetchData();
    return result;
  } catch ([1]) {
    console.error('Error loading data');
  }
}

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

Aexception

Berr

Ce

Derror

Attempts:

3 left

💡 Hint

Common Mistakes

Leaving catch parentheses empty, which prevents access to the error object.

The catch block must include a variable to receive the error object for proper error handling and logging.

4fill in blank

hard

Fill both blanks to create an async function that handles errors and returns a default value.

Node.js

async function fetchWithDefault() {
  try {
    const data = await fetchData();
    return data;
  } catch ([1]) {
    console.error('Fetch failed:', [2]);
    return null;
  }
}

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

Aerror

Berr

Ce

Dexception

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names in catch and console.error.

Using the same variable name error in both blanks matches the catch parameter and the logged error.

5fill in blank

hard

Fill all three blanks to create an async function that tries to fetch data, logs errors, and throws a new error.

Node.js

async function getData() {
  try {
    const response = await fetch('https://api.example.com');
    const data = await response.json();
    return data;
  } catch ([1]) {
    console.error('Fetch error:', [2]);
    throw new [3]('Failed to get data');
  }
}

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

Aerror

Berr

CError

DException

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatching variable names between catch and console.error.

Throwing a non-existent error class.

The catch parameter is err (B), the logged error is err (B), and the thrown error is a new Error object (C).