32 questions for “Express & Middleware”

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Node.js Express & Middleware 15

Information Technology

32 questions in 2 technologies

#	Question	Technology	Topic	Level
1	What is the difference between application-level, router-level, and route-specific middleware in Express? Node.js › Express & Middleware	Node.js	Express & Middleware	Intermediate
2	What does the express.json() and express.urlencoded() built-in middleware do, and why must it be registered before routes that need to read req.body? Node.js › Express & Middleware	Node.js	Express & Middleware	Intermediate
3	What is the purpose of the express.static() built-in middleware, and how would you use it to serve a folder of static assets? Node.js › Express & Middleware	Node.js	Express & Middleware	Beginner
4	What is middleware in Express, and what is the significance of the order in which middleware is registered? Node.js › Express & Middleware	Node.js	Express & Middleware	Intermediate
5	What is the purpose of the helmet middleware package for an Express application, and what specific security headers does it set? Node.js › Express & Middleware	Node.js	Express & Middleware	Intermediate
6	What is CORS middleware in Express, and how does the cors package simplify configuring Cross-Origin Resource Sharing? Node.js › Express & Middleware	Node.js	Express & Middleware	Intermediate
7	How do you write custom Express middleware that needs to perform asynchronous work, like checking a value against a database, before calling next()? Node.js › Express & Middleware	Node.js	Express & Middleware	Advanced
8	How would you implement request validation middleware in Express using a schema-validation library like Zod or Joi? Node.js › Express & Middleware	Node.js	Express & Middleware	Advanced
9	How would you implement a request-logging middleware in Express that captures method, path, status code, and response time for every request? Node.js › Express & Middleware	Node.js	Express & Middleware	Advanced
10	How would you implement conditional middleware in Express that only applies to certain requests based on a runtime condition? Node.js › Express & Middleware	Node.js	Express & Middleware	Advanced

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