Javascript Interview Questions

18 real Javascript questions asked in live technical interviews — each with a model answer. Updated weekly.

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These Javascript interview questions were captured from real interviews by candidates using Assisting AI. Each links to a full model answer. For real-time help during your own interview, get Assisting AI from ₹500/day.

Given the following JSON object, write code to output the email address and each student's math marks.🟡 Medium · Coding · Asked 1×What is React JS?🟢 Easy · Conceptual · Asked 1×What will be the output of the following code: console.log(a); var a = 10;🟢 Easy · Conceptual · Asked 1×What is the output of the following JavaScript code? ```js function outer() { let count = 0; return function inner() { count++; console.log(count); }; } const fn = outer(); fn(); fn(); fn(); ```🟢 Easy · Coding · Asked 1×Explain the concept of promises in JavaScript.🟢 Easy · Conceptual · Asked 1×Explain how setTimeout and setInterval work in JavaScript.🟢 Easy · Conceptual · Asked 1×Is an IIFE immediate?🟢 Easy · Conceptual · Asked 1×Are data types available in JavaScript?🟢 Easy · Conceptual · Asked 1×Can you open any JavaScript compiler?🟢 Easy · Conceptual · Asked 1×Describe the difference between the var and let keywords in JavaScript.🟢 Easy · Conceptual · Asked 1×What is the event loop in JavaScript?🟡 Medium · Conceptual · Asked 1×How do you execute code after a certain amount of time or at regular intervals in JavaScript?🟢 Easy · Conceptual · Asked 1×What issues can arise from using the 'do' keyword in JavaScript?🟡 Medium · Conceptual · Asked 1×Can you explain how to handle basic data fetching in ReactJS?🟡 Medium · Conceptual · Asked 1×What is wrong with the following JavaScript code that uses async/await?🟡 Medium · Debugging · Asked 1×What is the output of the following JavaScript code?🟢 Easy · Conceptual · Asked 1×How would you render the list of names in a React component?🟢 Easy · Coding · Asked 1×How do you print the array ['Ram', 'John', 'Sara'] in React?🟢 Easy · Coding · Asked 1×

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