Using third-party middleware

There are a lot of third-party middleware functions that you can use in your Express applications. Let’s see how to install and use them.

One of the most popular middleware functions is body-parser (https://www.npmjs.com/package/body-parser). Basically, it will parse the HTTP body of the incoming request and make it available under the req.body property.

Install it using npm as follows:

npm install body-parser@1

Then you can import it and use it in your application. Create a new file called echo_payload.js with the following content:

import express from 'express'
import bodyParser from 'body-parser'
const app = express()
const port = 3000
app.use(bodyParser.json())
app.post('/echo', (req, res) => {
    // Echo the request body
    res.json(req.body)
})
app.listen(port, () => {
  console.log(`running at http://localhost:${port}`)
})

Now run the application...