How is a route handler related to middleware?
A route handler is just a final middleware. It is the last function in the chain for that route. The same (req, res, next) signature applies, but handlers usually send the response instead of calling next.
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More FAQs in What Is Express Middleware? Explained With Examples
A function with the signature (req, res, next) that runs on requests. It can modify req, send a response, call next to continue, or call next(err) to jump to the error handler. Almost everything in Express is middleware.
Modify req (e.g., set req.user from JWT), send a response and end the cycle, call next() to pass to the next middleware, or call next(err) to jump to the error handler.
App-level (app.use), router-level (router.use), built-in (express.json), third-party (cors, helmet), and error-handling (four parameters: err, req, res, next).
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