Revise and Learn all Your Concepts

Routing

HTTP methods (GET, POST, PUT, DELETE)

Route parameters

:paramName
req.params

Query parameters

?key=value
req.query

Handling routes

Middleware functions

Routing middleware

Deployment

Hosting on platforms like Heroku, AWS, DigitalOcean

Process managers like PM2

pm2

Containerization with Docker

Docker

Middleware

Application-level middleware

app.use()
app.METHOD()

Router-level middleware

router.use()
router.METHOD()

Error-handling middleware

(err, req, res, next)
app.use()

Built-in middleware

Third-party middleware

Templates & Views

Template engines (e.g. Pug, EJS)

app.set()
app.engine()

Rendering templates

res.render()

Passing data to templates

res.render()

Request & Response

res.attachment()

res.clearCookie()

res.download()

res.location()

res.redirect()

res.sendFile()

res.sendStatus()

Request & Response
Objects

Accessing request data (headers, query, params, body)

req.headers
req.query
req.params
req.body

Sending responses (status codes, headers, content)

Redirects

res.redirect()

Serving static files

express.static()

File Uploads

Handling file uploads

req.files

Using middleware like multer

Security

CSRF protection

csurf
express-validator

XSS protection

HTT PSconfiguration

Error Handling

app.use((err, req, res, next) => {...})