Express.js Test

Why this matters?

Middleware is a key aspect of Express.js, and an Express.js professional should have a strong understanding of how it works and how to use it effectively in projects.

What to listen for?

Listen for an answer that demonstrates the candidate's understanding of how Express.js middleware works, and how it can be used to add functionality to applications. The candidate should be able to provide an example of how they have used middleware in a project, and how it helped to solve a particular problem or improve performance.

Why this matters?

Routing is a critical aspect of building applications with Express.js, and an Express.js professional should be able to design and implement efficient and scalable routes.

What to listen for?

Listen for an answer that demonstrates the candidate's understanding of how to handle routing in Express.js, and any best practices they follow for designing and implementing routes. The candidate should be able to discuss how they handle different types of routes (e.g. GET, POST, PUT, DELETE), and how they ensure that routes are efficient and maintainable.

Why this matters?

Error handling is an important aspect of building reliable and robust applications with Express.js, and an Express.js professional should be able to handle errors effectively.

What to listen for?

Listen for an answer that demonstrates the candidate's understanding of how to handle errors in Express.js, and any best practices they follow for handling errors. The candidate should be able to discuss how they have used error handling in a project, and how it helped to ensure that the application was reliable and easy to maintain.

Why this matters?

Performance is a critical aspect of building applications with Express.js, and an Express.js professional should be able to optimize performance and identify and resolve performance issues.

What to listen for?

Listen for an answer that demonstrates the candidate's understanding of how to optimize the performance of an Express.js application, and any tools or techniques they use to monitor and improve performance. The candidate should be able to discuss how they identify and resolve performance issues, and any best practices they follow to ensure that applications are fast and efficient.

Why this matters?

Server-side rendering and client-side rendering are both important techniques for building modern web applications, and an Express.js professional should have a strong understanding of these concepts and how to use them effectively.

What to listen for?

Listen for an answer that demonstrates the candidate's understanding of the differences between server-side rendering and client-side rendering, and how to use these techniques effectively in an Express.js application. The candidate should be able to provide an example of how they have used these techniques in a project, and how they helped to improve the performance and user experience of the application.