Express.js res.end() Function

The res.end() function is used to end the response process. This method actually comes from the Node core, specifically the response.end() method of HTTP.ServerResponse. Use to quickly end the response without any data.

Syntax:

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

Parameters: The default encoding is ‘utf8’ and the data parameter is basically the data with which the user wants to end the response.

Return Value: It returns on Object.

Installation of express module:



  1. You can visit the link to Install express module. You can install this package by using this command.
    npm install express
  2. After installing the express module, you can check your express version in command prompt using the command.
    npm version express
  3. After that, you can just create a folder and add a file for example, index.js. To run this file you need to run the following command.
    node index.js

Example 1: Filename: index.js

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var express = require('express');
var app = express();
var PORT = 3000;
  
// Without middleware
app.get('/', function(req, res){
    res.end();
});
  
app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

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Steps to run the program:

  1. The project structure will look like this:
  2. Make sure you have installed express module using the following command:
    npm install express
  3. Run index.js file using below command:
    node index.js

    Output:

    Server listening on PORT 3000
    
  4. Now open your browser and go to http://localhost:3000/ and you will see blank response as this function is use to quickly end the response without any data.

Example 2: Filename: index.js

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var express = require('express');
var app = express();
var PORT = 3000;
  
// With middlware
app.use('/user', function(req, res, next){
     console.log("/user called")
     res.end();
})
  
app.get('/user', function(req, res){
    console.log("User Page")
    res.end();
});
  
app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

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Run index.js file using below command:

node index.js

Now open your browser and go to http://localhost:3000/user, then you will see the following output on your console:

Server listening on PORT 3000
/user called

Reference: https://expressjs.com/en/4x/api.html#res.end




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