Express: res.set(field [, value]): Set http response header field

res.set(field [, value])

Sets the response’s HTTP header field to value.

res.set('Content-Type', 'text/plain');

You can even set multiple header fields at once, pass an object as the parameter.

         res.set({

           'Content-Type': 'text/plain',

           'name' : 'demo on response headers'

         })

index.js

'use strict'

const express = require('express')

const app = express()

app.get('/', (req, res) => {
 res.set({
   'Content-Type': 'text/plain',
   'name' : 'demo on response headers'
 })
 
 var contentType = res.get('Content-Type')
 var name = res.get('name')
 
 console.log(`contentType : ${contentType}`)
 console.log(`name : ${name}`)
 
 res.send('Hello World')

})

const port = 3000
app.listen(port, () => console.log(`Application started listening on port ${port}!`))

Run index.js

Open the url ‘http://localhost:3000/’ in browser.

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