Read and Write Files using fs Module

Question

Write a Node.js program to create a file, write data into it, and then read the file content using the fs module.

Coding Answer

const fs = require("fs");

// Write to file
fs.writeFile("example.txt", "Hello Node.js", (err) => {
  if (err) throw err;
  console.log("File written successfully");

  // Read file
  fs.readFile("example.txt", "utf8", (err, data) => {
    if (err) throw err;
    console.log("File content:", data);
  });
});

Preview

Run the file using Node.js:

node app.js

👉 Output in terminal:

File written successfully
File content: Hello Node.js

Explanation

fs module is used to work with the file system
writeFile() creates and writes data to a file
readFile() reads data from the file
Callbacks handle asynchronous operations
"utf8" ensures readable text output