Express.js
/Beginner
Intermediate Questions
Definition
Intermediate interviews test your ability to structure applications, handle errors, and integrate with databases. ### Sample Questions 1. **Explain the execution order of Middleware.** 2. **How does an Error Handling middleware differ from a standard middleware?** 3. **What is the purpose of `express.Router`?** 4. **How do you handle async errors in Express route handlers?** 5. **Explain the concept of CORS and how to configure it.**
Explain Like I'm New
Intermediate interviews test your ability to structure applications, handle errors, and integrate with databases. ### Sample Questions 1.
Terminal Output
bash / terminal
# Example Answer for #2:
Standard middleware has 3 arguments: `(req, res, next)`.
Error Handling middleware MUST have 4 arguments: `(err, req, res, next)`. Express specifically looks for the function signature with 4 parameters to designate it as the error catcher.
Interview Questions
basic
- What is the primary purpose of Intermediate Questions in Express.js?
- How do you initialize Intermediate Questions?
intermediate
- How does Intermediate Questions integrate with other middleware components?
- Can you explain a common use case for Intermediate Questions?
advanced
- What are the performance implications of Intermediate Questions in a high-traffic production application?
- How would you debug issues related to Intermediate Questions?
trick
- Is it possible to achieve the same result as Intermediate Questions without using Express?