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Interview prep
JavaScript interview questions for freshers and mid-level developers: core language concepts, Node.js and React, each with the answer and an explanation of why the other options are wrong.
Start where you are; each paper is 12 questions with a timer and a topic-by-topic report.
Fresher0–1 year
12 JavaScript interview questions for freshers and students (0 to 1 year): const and let, types and coercion, equality, scope, arrays and event bubbling. Each answer explains why the other options are wrong.
Mid-level2–5 years
12 JavaScript interview questions for developers with some experience (2 to 5 years): closures, this and bind, async/await order, event delegation, Promise combinators and copying arrays. Each answer explains why the other options are wrong.
Senior5+ years
12 JavaScript interview questions for senior and lead developers (5+ years): the event loop in depth, WeakMap, structuredClone, private fields, prototypes, Symbols, Proxy and memory leaks. Each answer explains why the other options are wrong.
All levelsmixed experience
20 JavaScript interview questions with answers: 10 on core JavaScript, 5 on Node.js and 5 on React, covering closures, hoisting, the event loop, promises, Express errors and React state.
Most technical rounds include a coding task. Write JavaScript or Python, run it against tests in your browser, then read a full solution.
Browse coding problemsMost web developer interviews in India start with core JavaScript and then move to whichever side of the stack the role is for: Node.js on the server or React in the browser. Interviewers often show a short snippet and ask what it prints, to see whether you can reason about code rather than recite definitions.
var/let/const and hoisting, closures, this, the event loop and promises.Answer each question before opening the explanation, and say your reasoning out loud the way you would in an interview. For snippet questions, paste the code into your browser console or a Node.js file and change one line at a time until the output makes sense.