How to use the Node.js Interview Flashcards
- 1. Choose topicsPick one topic or all of them, a round size, and whether to skip cards you already know.
- 2. Flip and gradeRead the question, answer aloud, then reveal the answer and mark it known or still learning.
- 3. Review your resultsMissed cards come back later in the round. At the end see your score by topic and download the cards to revise.
What the deck covers
This deck is for MERN and Node back-end roles, covering how Node runs code, how packages are managed, and how Express apps are built and secured. The 23 cards are grouped into 11 topics: Basics, Event loop, Modules, npm, Core, Express, Async, Scaling, Security, APIs, Testing. Answers are short on purpose: one or two sentences you can say out loud, which you then back up with an example from your own projects.
A card from the deck
Q: What blocks the event loop?
A: Long synchronous work: heavy loops, big JSON.parse, synchronous fs calls, complex regex. Move it to worker threads or another service.
Mention that heavy synchronous work blocks everything, which is why CPU-heavy tasks belong in worker threads.
How to study with it
- Pair the security cards with a real checklist for your own project before interviews.
- Practise explaining middleware order with a small Express app.
- In the Node.js deck, cards you mark "still learning" come back three cards later in the same round, and the results screen lists them so you can download a revision sheet.
More questions from this deck
Other Node.js questions you'll meet include:
- Why is Node.js good for I/O-heavy apps?
- Why commit package-lock.json?
- What is a Buffer?
- What happens with an unhandled promise rejection?
- What is JWT and where is it stored?
Frequently asked questions
Which Node version?
Current LTS versions (20 and 22).
Is NestJS covered?
No. The cards focus on Node and Express fundamentals.
Are the Node.js interview flashcards free?
Yes. You can flip through every card of the Node.js interview flashcards without signing up. When you open your results for the first time, we ask once for your name and WhatsApp number; after that the Node.js interview flashcards and every other Uncodemy tool open straight away.