expressjsHow can I use Express.js decorators to create a dynamic web application?
Express.js decorators allow developers to create a dynamic web application with ease. The decorators provide a way to dynamically change the behavior of an application without changing the code.
For example, the following code uses the express.decorate()
decorator to add a /hello
route to the application.
const express = require('express')
const app = express()
app.decorate('hello', (req, res) => {
res.send('Hello World!')
})
app.listen(3000, () => {
console.log('Server running on port 3000')
})
Output example
Server running on port 3000
The code above adds a /hello
route to the application. When a request is made to the /hello
route, the express.decorate()
decorator will execute the function and send the response Hello World!
.
The decorator can also be used to add dynamic behavior to the application. For example, the following code uses the express.decorate()
decorator to add a /user
route with dynamic behavior.
app.decorate('user', (req, res) => {
let userId = req.params.userId
res.send(`User ${userId}`)
})
When a request is made to the /user/:userId
route, the express.decorate()
decorator will execute the function and send the response User {userId}
where {userId}
is the value of the userId
parameter.
By using Express.js decorators, developers can easily create a dynamic web application.
Helpful links
More of Expressjs
- How do I find Express.js tutorials on YouTube?
- How can I use Express.js to prevent XSS attacks?
- How do I use Express.js to handle a request query?
- How can I disable the X-Powered-By header in Express.js?
- How can I use Express.js with TypeScript?
- What is Express.js?
- How do I use Express.js with W3Schools?
- How can I use Express.js with React to develop a web application?
- How can I use OpenTelemetry with Express.js?
- How do I use Zod with Express.js?
See more codes...