Answer
Middleware functions run between a request and response for tasks like parsing, logging, or validation.
Quick Answer
Middleware is a function that sits between the request and response in the request pipeline. It receives the request, can modify it, perform logic (authentication, logging, parsing), and either send a response or pass control to the next middleware. In Express: app.use((req, res, next) => { ... next(); }).
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ