1 Essential Express.js Interview Questions *

Toptal sourced essential questions that the best Express.js developers and engineers can answer. Driven from our community, we encourage experts to submit questions and offer feedback.

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Interview Questions

1.

What function arguments are available to Express.js route handlers?

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The arguments available to an Express.js route handler function are:

  • req - the request object
  • res - the response object
  • next (optional) - a function to pass control to one of the subsequent route handlers

The third argument may be omitted, but is useful in cases where you have a chain of handlers and you would like to pass control to one of the subsequent route handlers, and skip the current one.

There is more to interviewing than tricky technical questions, so these are intended merely as a guide. Not every “A” candidate worth hiring will be able to answer them all, nor does answering them all guarantee an “A” candidate. At the end of the day, hiring remains an art, a science — and a lot of work.

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Looking for Express.js Developers?

Looking for Express.js Developers? Check out Toptal’s Express.js developers.

Alejandro Hernandez

Freelance Express.js Developer
ArgentinaToptal Member Since October 30, 2012

Alejandro got his bachelor's degree in software engineering in 2005 and has since been working for software companies of all sizes from all around the globe as a freelancer. Currently, he enjoys working as a full-stack architect in JavaScript projects, where his experience and his deep understanding of architecture and theory are most impactful.

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Luuk van Egeraat

Freelance Express.js Developer
United Arab EmiratesToptal Member Since February 17, 2013

Luuk is a TypeScript developer focused on rapid development. With experience in diverse industries, including AI and machine learning, he excels at creating exceptional user experiences. Luuk effectively bridges the work of API developers and UX designers, having collaborated with experts in both areas. He has a proven background in building scalable Node.js APIs and complex React front ends. As a clear communicator, Luuk excels at listening, translating ideas, and getting things done.

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Tomislav Capan

Freelance Express.js Developer
CroatiaToptal Member Since February 20, 2013

Tomislav is a software engineer, technical consultant, and solution architect who began as a technical partner for an online media business, growing it from zero to over 100,000 monthly readers. After years in software engineering, he now provides technical leadership through consulting and architecting dynamic, reliable, and scalable cloud solutions to support business growth and optimize complex architectures gone wrong. As an infrastructure lead, Tomislav makes the cloud a friendly place.

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