[Solved] What is the issue with this Node.js HTTP server code?import http from 'http'; const server = http.createServer((req, res) => { res.writeHead(200, {'Content-Type': 'application/json'}); res.end(JSON.... | Node.js

Node.js - HTTP Module

What is the issue with this Node.js HTTP server code?

import http from 'http';
const server = http.createServer((req, res) => {
  res.writeHead(200, {'Content-Type': 'application/json'});
  res.end(JSON.stringify({ message: 'Hi' }));
});
server.listen('port3000');

AJSON.stringify should not be used inside res.end()

BThe Content-Type header is incorrect for JSON responses

CThe port argument to listen() is invalid; it must be a number

DThe server.listen() method is missing a callback function

Step-by-Step Solution

Solution:

Step 1: Check server.listen argument
The argument 'port3000' is a string and not a valid port number.
Step 2: Validate port type
listen() expects a numeric port, e.g., 3000, not a string with letters.
Final Answer:
The port argument to listen() is invalid; it must be a number -> Option C
Quick Check:
Port must be numeric, not a string with letters [OK]

Quick Trick: Port must be a number, not a string [OK]

Common Mistakes:

Passing port as a string with letters
Confusing Content-Type header for JSON
Thinking callback is mandatory for listen()

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More Node.js Quizzes

What is the issue with this Node.js HTTP server code?

Step 1: Check server.listen argument

Step 2: Validate port type

Final Answer:

Quick Check:

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