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res.clearCookie() clears a cookie from the response.

The default port for an Express server is often 3000.

res.cookie() sets a cookie in the response.

app.get(‘env’) returns the environment mode (e.g., development).

express.urlencoded() handles URL-encoded form data.

next() passes control to the next middleware function.

app.use(express.json()) parses JSON request bodies.

app.listen() starts the Express server to listen for requests.

res.redirect() redirects a request to another URL.

req.query contains query string parameters in Express.

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