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Node.js
Backend
Node.js
Server-side JavaScript runtime: event loop, async, streams and scaling.
30
questions
updated weekly
Junior
10
Middle
12
Senior
8
Node.js questions
30 / 30 shown
Default
Popular
Newest
›
What is the event loop in Node.js and how does it work?
Junior
#Runtime
#Async
Details →
›
Compare callbacks, Promises and async/await.
Junior
#Async
Details →
›
What are streams in Node.js and when should you use them?
Middle
#Streams
#Performance
Details →
›
How do you scale a Node.js app across multiple CPUs?
Senior
#Scaling
#Performance
Details →
›
How do you detect and fix memory leaks in Node.js?
Senior
#Debugging
#Performance
Details →
›
What is Node.js and what is it good for?
Junior
#Runtime
#Nodejs
Details →
›
What is the difference between CommonJS and ES Modules in Node?
Junior
#Modules
Details →
›
What is npm and what do package.json and the lockfile do?
Junior
#Tooling
#Nodejs
Details →
›
What is the process object and what can it do?
Junior
#Runtime
#Nodejs
Details →
›
How do you work with the file system in Node?
Junior
#Core
#Nodejs
Details →
›
How do you create a basic HTTP server in Node?
Junior
#Core
#Nodejs
Details →
›
What are Buffers in Node.js?
Junior
#Core
#Nodejs
Details →
›
Why use the path module instead of string concatenation?
Junior
#Core
#Nodejs
Details →
›
What is the EventEmitter and how is it used?
Middle
#Events
#Nodejs
Details →
›
How does Express middleware work?
Middle
#Framework
#Nodejs
Details →
›
How do you handle errors in async Node code?
Middle
#Error Handling
Details →
›
How do you run external processes with child_process?
Middle
#Process
#Nodejs
Details →
›
When and how do you use worker threads?
Middle
#Performance
Details →
›
What utilities help work with async code (promisify, AbortController)?
Middle
#Async
Details →
›
How do you manage configuration and secrets in Node?
Middle
#Framework
#Nodejs
Details →
›
What are npm scripts and lifecycle hooks?
Middle
#Tooling
#Nodejs
Details →
›
How do you hash passwords and use the crypto module?
Middle
#Security
Details →
›
What is CORS and how do you handle it in Node?
Middle
#Security
Details →
›
What caching strategies improve a Node API's performance?
Middle
#Performance
Details →
›
How do you profile and optimize Node.js performance?
Senior
#Performance
Details →
›
What are key security best practices for a Node.js app?
Senior
#Security
Details →
›
How do you implement graceful shutdown?
Senior
#Reliability
#Nodejs
Details →
›
What should you consider when building microservices in Node?
Senior
#Architecture
Details →
›
How do you approach logging and monitoring in production Node?
Senior
#Reliability
#Nodejs
Details →
›
What is backpressure in streams and how do you handle it?
Senior
#Streams
#Performance
Details →
