Reading & Writing Files

The fs module lets you read, write, and manipulate files.

Syntax

NODEJS

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const fs = require('fs');

// Read file
const data = fs.readFileSync('file.txt', 'utf8');

// Write file
fs.writeFileSync('output.txt', 'Hello World');

File System Operations

NODE

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const fs = require("fs");

// Write file
fs.writeFileSync("example.txt", `Hello, Node.js!
Line two`);

// Read file
const content = fs.readFileSync("example.txt", "utf-8");
console.log(content);

// Async read
fs.readFile("example.txt", "utf-8", (err, data) => {
    if (err) throw err;
    console.log(data);
});

Try It Yourself

Practice

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Exercise

Practice this concept.

Answer

Write the code as shown above.

Quick Quiz

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What did you learn?

Concept A

Concept B

Concept C

Concept D

This covers the basics.

Retry Quiz

Interview Questions

Explain this concept.

It is a fundamental Node.js feature.

Next Lesson

File Streams