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Cloudflare · Node Js
Practice Node Js questions specifically asked in Cloudflare interviews – ideal for online test preparation, technical rounds and final HR discussions.
Questions
10
Tagged for this company + subject
Company
Cloudflare
View company-wise questions
Subject
Node Js
Explore topic-wise practice
Go through each question and its explanation. Use this page for targeted revision just before your Cloudflare Node Js round.
The DNS (Domain Name System) module provides methods to resolve domain names to IP addresses. It can perform both asynchronous lookups and direct OS-level resolution using `dns.lookup()` and `dns.resolve()`.
const dns=require('dns');
dns.lookup('google.com',(err,addr)=>console.log(addr));For complete preparation, combine this company + subject page with full company-wise practice and subject-wise practice. You can also explore other companies and topics from the links below.
Punycode converts Unicode domain names (like emoji or non-English characters) into ASCII format for DNS compatibility. Node.js includes the Punycode module for backward compatibility with international domains.
const punycode=require('punycode/');
console.log(punycode.encode('mañana'));Node’s `https` module lets you create secure servers using SSL/TLS certificates. HTTPS ensures encrypted communication between clients and servers, preventing eavesdropping and data tampering.
const https=require('https');
const fs=require('fs');
const opts={key:fs.readFileSync('key.pem'),cert:fs.readFileSync('cert.pem')};
https.createServer(opts,(req,res)=>res.end('Secure!')).listen(443);The TLS module provides SSL/TLS protocols for encrypting data over the network. It’s built on OpenSSL and ensures secure communication between clients and servers.
const tls=require('tls');
const server=tls.createServer({key,cert},()=>console.log('TLS Active'));Use packages like `express-rate-limit` or Redis-based counters to restrict requests per user or IP. It protects servers from abuse and ensures fair usage.
import rateLimit from 'express-rate-limit';
const limiter=rateLimit({windowMs:60000,max:100});
app.use(limiter);The crypto module enables secure data encryption, hashing, and signing. It supports algorithms like AES, RSA, and SHA, helping developers secure passwords, tokens, and sensitive data.
const crypto=require('crypto');
const hash=crypto.createHash('sha256').update('secret').digest('hex');
console.log(hash);Use HTTPS, sanitize input, apply Helmet middleware, rate-limit endpoints, and validate JWTs. Avoid eval(), keep dependencies updated, and store secrets in environment variables.
Use the `compression` middleware in Express to reduce response size and speed up content delivery.
import compression from 'compression'; app.use(compression());
TLS (Transport Layer Security) encrypts data between client and server, preventing eavesdropping and tampering. Node’s `https` and `tls` modules enable secure communication using certificates.
The `dns.lookup()` method converts domain names into IP addresses. It’s part of Node’s built-in `dns` module and is used internally by HTTP requests to resolve hostnames before making connections.
const dns=require('dns');
dns.lookup('google.com',(err,address)=>console.log(address));