Reading files with promises (fs.promises) in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the promises API from the fs module.

Node.js

import { [1] } from 'fs';

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Apromises

BreadFile

CwriteFile

DcreateReadStream

Attempts:

3 left

💡 Hint

Common Mistakes

Importing 'readFile' directly instead of from 'fs.promises'.

Using 'createReadStream' which is not promise-based.

The promises object from the fs module provides promise-based file system methods.

2fill in blank

medium

Complete the code to read a file named 'data.txt' using promises.

Node.js

const data = await promises.[1]('data.txt', 'utf-8');

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AwriteFile

BappendFile

CreadFile

Dunlink

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'writeFile' which writes data instead of reading.

Using 'appendFile' which adds data to a file.

The readFile method reads the contents of a file and returns a promise.

3fill in blank

hard

Fix the error in the async function to correctly read 'info.txt'.

Node.js

async function readInfo() {
  const content = await promises.[1]('info.txt', 'utf-8');
  return content;
}

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AreadStream

BreadFileSync

Cread

DreadFile

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'readFileSync' inside an async function with await causes errors.

Using non-existent methods like 'readStream'.

readFile is the correct async method returning a promise. readFileSync is synchronous and not used with await.

4fill in blank

hard

Fill both blanks to handle errors when reading 'notes.txt' with promises.

Node.js

try {
  const notes = await promises.[1]('notes.txt', 'utf-8');
  console.log(notes);
} catch ([2]) {
  console.error('Error reading file:', err);
}

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AreadFile

BwriteFile

Cerror

Derr

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'writeFile' instead of 'readFile' to read files.

Not naming the error parameter in catch block.

Use readFile to read the file and catch the error with a variable like err to handle exceptions.

5fill in blank

hard

Fill all three blanks to create an async function that reads 'log.txt' and returns its content or an error message.

Node.js

async function readLog() {
  try {
    const content = await promises.[1]('log.txt', [2]);
    return content;
  } catch ([3]) {
    return 'Failed to read file';
  }
}

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

AreadFile

B'utf-8'

Cerror

DwriteFile

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'writeFile' instead of 'readFile'.

Omitting the encoding string or using wrong quotes.

Not naming the error parameter in catch.

The function uses readFile with encoding 'utf-8' and catches errors with the variable error.