VIP Exclusive
Express.js VIP Certification Practice Exam
Express JS — There is no single standardized certification exam for Express.js issued by a formal licensing body; Express.js is an open-source Node.js framework maintained by the OpenJS Foundation. This is an original comprehensive practice set modeled on the skill domains tested by major developer assessment platforms (HackerRank, Pluralsight IQ, LinkedIn Skill Assessments) and aligned with real-world Express.js interview and production usage patterns.
29
Questions
75m
Time Limit
75.00%
To Pass
Question 1 of 29👑 VIP
You are initializing a new Express application. After running `npm install express`, you write the following: js const express = require('express'); const app = express(); app.listen(3000); A colleague insists you should call `app.listen(3000, callback)` with a callback. What is the primary purpose of that optional callback argument?
Questions 2–29 and full explanations are VIP-exclusive.