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Express.js – res.headersSent Property
res.headersSent returns a Boolean value that indicates if the app has sent HTTP headers for the response or not. If the headers are sent, it returns True; else False.
Syntax
res.headersSent
Example 1
Create a file with the name "headersSent.js" and copy the following code snippet. After creating the file, use the command "node headersSent.js" to run this code as shown in the example below −
// res.headersSent Property Demo Example
// Importing the express module
var express = require('express');
// Initializing the express and port number
var app = express();
// Initializing the router from express
var router = express.Router();
var PORT = 3000;
// Defining an endpoint and checking headers
app.get('/api', function (req, res) {
// Checking the headers before sending response
console.log(res.headersSent);
res.send('Welcome To TutorialsPoint');
});
app.listen(PORT, function(err){
if (err) console.log(err);
console.log("Server listening on PORT", PORT);
});Hit the following Endpoint with a GET request – localhost:3000/api
Output
C:\home
ode>> node headersSent.js Server listening on PORT 3000 false
Example 2
Let's take a look at one more example.
// res.headersSent Property Demo Example
// Importing the express module
var express = require('express');
// Initializing the express and port number
var app = express();
// Initializing the router from express
var router = express.Router();
var PORT = 3000;
// Defining an endpoint and checking headers
app.get('/api', function (req, res) {
// Checking the headers before sending response
console.log(res.headersSent);
res.send('Welcome To TutorialsPoint');
// Checking the headers after sending response
console.log("Headers Sent: ", res.headersSent);
});
app.listen(PORT, function(err){
if (err) console.log(err);
console.log("Server listening on PORT", PORT);
});Hit the following Endpoint with a GET Request – localhost:3000/api
Output
C:\home
ode>> node headersSent.js Server listening on PORT 3000 false Headers Sent: true
Updated on: 28-Mar-2022
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