Express.js – res.end() Method

The res.end() method ends the current response process. This method is used to quickly end the response without any data. If one needs to respond with data, they should use either the res.send() method or the res.json() method.

Syntax

res.end([data], [encoding])

Default encoding is 'utf-8'.

Example 1

Create a file with the name "resEnd.js" and copy the following code snippet. After creating the file, use the command "node resend.js" to run this code as shown in the example below −

// res.end() Method 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
app.get('/api', function (req, res) {
   console.log("Ending the process without any data");
   res.end();
});
app.listen(PORT, function(err){
   if (err) console.log(err);
   console.log("Server listening on PORT", PORT);
});

Output

Hit the following Endpoint with a GET request: localhost:3000/api

C:\home\node>> node resEnd.js
Server listening on PORT 3000
Ending the process without any data

Example 2

Let's take a look at one more example.

// res.end() Method 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
app.get('/api', function (req, res) {
   console.log("Ending the process without any data");
   res.end();
   res.send("Data sent after ending the process");
});
app.listen(PORT, function(err){
   if (err) console.log(err);
   console.log("Server listening on PORT", PORT);
});

Output

Hit the following Endpoint with a GET Request: "localhost:3000/api"

C:\home\node>> node resEnd.js
Server listening on PORT 3000
Ending the process without any data

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client

at ServerResponse.setHeader (_http_outgoing.js:470:11)
at ServerResponse.header (/home/node/test/node_modules/express/lib/response.js:771:10)
at ServerResponse.contentType (/home/node/test/node_modules/express/lib/response.js:599:15)
at ServerResponse.send (/home/node/test/node_modules/express/lib/response.js:145:14)
at /home/node/test/express.js:16:6