Express.js · question
Question 3 of 44
What are the different types of middleware in Express.js?
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- Application-level middleware - Bound to app object using
app.use()
- Router-level middleware - Bound to router object using
router.use()
- Error-handling middleware - Takes four arguments (err, req, res, next)
- Built-in middleware - Provided by Express (express.static, express.json)
- Third-party middleware - From npm packages (morgan, cors, helmet)
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