Updated for 2026! This repository contains a few hundred curated JavaScript interview questions with high quality answers for acing your Front End Engineer interviews, brought to you by GreatFrontEnd.
Looking for more? Read our blog post 50+ must-know JavaScript interview questions and answers compiled from ex-FAANG interviewers.
Note
This repository is a public mirror. GreatFrontEnd's main repository is the source of truth for question content; use this repository's Issues to report problems instead of opening content pull requests.
The questions are divided into three sections:
- Top questions: List of the most important JavaScript interview questions that are commonly-asked during Front End Developer interviews. This README displays the concise version of the answers and links are provided to the full version of answers for further learning. If you are are short on time, start with this section.
- All questions: Comprehensive and elaborate list of JavaScript interview questions that ranges from basic to advanced topics. The answers in this section are more concise. This section is useful if you rusty with JavaScript concepts and need a refresher.
- Questions by difficulty: Questions categorized by difficulty – basic, intermediate, advanced.
This list contains the top essential questions that are frequently-asked during Front End Engineer interviews. Concise versions of the answers are presented here with links to elaborate versions for further reading. This section is great if you need a quick refresher of the most important concepts.