JavaScript Interview
Questions & Practice.
Practice real JavaScript interview questions, take timed Interview Sprint and know exactly if you're ready.
AI Answer Evaluator
Know exactly where you stand
Type your answer. Get scored 1–10 with specific gaps — not "great job".
⚡ New: Interview Sprint
The fastest way to know if you're ready
A timed mixed-question challenge. Theory + output + debugging. AI judges your answers. One score tells you exactly where you stand.
Mixed question types under time pressure — exactly how interviews work
No multiple choice. You explain in your own words, AI grades like a senior engineer
After each sprint: know exactly which categories to keep drilling
Download or tweet your result — challenge your network to beat your score
What does this print?
console.log([] + [])
console.log([] + {})
console.log({} + [])What is a closure in JavaScript?
Four Practice Modes
How real JavaScript interviews test you
Most prep sites are theory-only. Real JavaScript interviews use all four.
Core JS theory with AI-graded written answers. Not MCQ — you explain it.
Predict what the console prints. The most common real interview format.
Find and fix real bugs. AI tells you exactly what you missed.
Write Array.map, Promise.all and bind from scratch with test feedback.
Beyond Questions
A full interview prep ecosystem
Not just a list of Q&As — habits, accountability, and depth.
Builds the daily prep habit without overwhelm. Free for everyone — no Pro needed. Track your streak.
Why devs switch to JSPrep Pro
Real developers. Real offers.
They prepped here. They got in.
Not "I liked the UI." — Developers, interviews, outcomes.
The questions I practiced were almost identical to what was asked in my interview — something I wouldn’t have prepared on my own. Great platform for targeted prep.
The AI evaluator is the real thing. It told me I was hand-waving through closures. Fixed it, aced the Bajaj Finser Health round. Worth every rupee.
Failed my first Atlassian screen because of the event loop. Spent a week here, went back for round 2, passed. Completely different outcome.
40 Topic Deep-Dives
Every JavaScript concept, interview-ready
Each topic has a mental model, full explanation, cheat sheet, and practice questions. Not just a Q&A list.
6 AI Features
Your AI interview coach
Not a chatbot you switch to. AI is inside every question, every answer, every debug.
Type your answer, get scored 1–10 with specific gaps
Ask follow-ups on any question, get real examples
AI validates your fix and suggests a cleaner approach
Full back-and-forth with an AI senior engineer
Personalized day-by-day prep from your weak spots
36-topic revision cards, printable PDF
Pricing
Simple. Transparent.
Start free with 93 real questions and AI feedback from day one.
- All theory questions
- Interview Sprint — 5-question warmup
- Daily Question of the Day + AI eval
- First 5 output + 5 debug questions
- First 5 polyfill challenges
- Weekly XP leaderboard
- Interview Cheat Sheet
- Deep Dives (in-depth concept explanations)
- Everything in Free
- Interview Sprint — unlimited
- All output, debug, polyfill questions
- Unlimited mastery tracking
- Bookmarks + cloud sync
- Timed quiz / flashcard mode
- AI Tutor on every question
- AI Answer Evaluator
- AI Code Checker
- AI Mock Interviewer
- AI Study Plan generator
- Daily streak tracking
- All future content
You'll sign in or create an account during checkout
Ready to prep smarter?
93 questions free. AI feedback from question one. No card needed.
Start Free — No Card Needed