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AWS · Node Js
Practice Node Js questions specifically asked in AWS interviews – ideal for online test preparation, technical rounds and final HR discussions.
Questions
13
Tagged for this company + subject
Company
AWS
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 AWS Node Js round.
Piping connects the output of one stream directly into another stream, commonly used to transfer data efficiently between files or network responses. It eliminates manual data handling.
const fs = require('fs');
fs.createReadStream('input.txt').pipe(fs.createWriteStream('output.txt'));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.
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.
LTS stands for Long-Term Support. These Node.js versions receive stability, security, and bug fixes for about 30 months, making them suitable for production environments.
Node.js apps can be deployed using PM2, Docker, or cloud platforms like AWS, Vercel, and Heroku. The process includes building the app, setting environment variables, and using a reverse proxy like Nginx for routing.
pm2 start app.js --name myapp pm2 logs myapp
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);Graceful shutdown ensures open connections and background tasks finish before exiting. You can listen for signals like SIGINT or SIGTERM and close servers cleanly.
process.on('SIGINT',()=>{
server.close(()=>{
console.log('Server closed gracefully');
process.exit(0);
});
});CI/CD automates testing, building, and deployment. CI ensures code integrity, while CD automates releases to production. Together, they reduce manual errors and accelerate delivery.
Load balancing can be achieved with Nginx, HAProxy, or PM2 cluster mode. It distributes incoming requests evenly across Node.js instances to prevent overload.
Connection pooling reuses existing database connections instead of creating new ones for each request, reducing latency and improving performance under high traffic.
Docker containers isolate app environments and dependencies, ensuring consistent deployments. You can scale containers easily using Docker Compose or Kubernetes.
FROM node:18 WORKDIR /app COPY . . RUN npm install CMD ['npm','start']
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'));`fs.readFile()` reads the entire file into memory before processing, making it suitable for small files. `fs.createReadStream()` reads chunks of data as streams, ideal for large files or real-time data transfer.
fs.createReadStream('large.txt').pipe(fs.createWriteStream('copy.txt'));Common strategies include in-memory cache (Node-cache), distributed cache (Redis), and HTTP-level caching using ETags or Cache-Control headers. Caching reduces repeated database hits and speeds up response times.
const cache=new Map();
function getUser(id){
if(cache.has(id)) return cache.get(id);
const user=db.find(id);
cache.set(id,user);
return user;
}