fs.writeFile() Method — Node.js Technical Interview Questions & Answers

fs.writeFile() Method

fs.writeFile() Method

  • fs.writeFile() Method is a Node.js topic. In plain words you use it for read a big CSV in an upload job. Don’t start with a slogan — start with that picture.
  • Smallest example: createReadStream. Type it, run it, and say what you see. If you can do that from memory, you know fs.writeFile() Method.
  • From the example next to this theory: fs.writeFile() Method — fs reads/writes files. Prefer promises/async APIs in real apps..
  • Trap: loading the whole file into RAM. Fix that before you talk about advanced Node.js.
  • Viva: what is fs.writeFile() Method? Then show createReadStream. Then name the trap.

Technical Interview Tip: What is fs.writeFile() Method? Show this: createReadStream. Trap: loading the whole file into RAM.

Code Examples for fs.writeFile() Method

fs.writeFile() Method — working example

const fs = require("fs");
const path = require("path");

const file = path.join(__dirname || ".", "demo.txt");
fs.writeFileSync(file, "hello node\n");
const text = fs.readFileSync(file, "utf8");
console.log(text.trim());
fs.unlinkSync(file);

fs.writeFile() Method — fs reads/writes files. Prefer promises/async APIs in real apps.

How to Explain fs.writeFile() Method to an Interviewer

What is fs.writeFile() Method?

Used for read a big CSV an upload job Not just the heading

Give one small example of fs.writeFile() Method.

createReadStream fs.writeFile() Method — fs reads/writes files. Prefer promises/async APIs in real apps.

What mistake do beginners make with fs.writeFile() Method?

loading the whole file into RAM Show the fix

Where do you use fs.writeFile() Method?

an upload job read a big CSV