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Express.js res.attachment() Function

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  • Last Updated : 13 Jul, 2022
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The res.attachment() function is used to set the HTTP response Content-Disposition header field to ‘attachment’. If the name of the file is given as filename, then it sets the Content-Type based on the extension name through res.type() function and finally sets the Content-Disposition ‘filename = ‘ parameter.

res.attachment( [filename] )

Parameter: The filename parameter describes the name of the file.
Return Value: It returns an Object.
Installation of express module: 

npm install express
  • After installing the express module, you can check your express version in command prompt using the command. 
npm version express
  • 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 


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

Place any file in root directory of the project which can be attached, like here we have used Hello.txt.
Steps to run the program: 

  1. The project structure will look like this: 

  • Make sure you have installed express module using the following command: 
npm install express
  • Run index.js file using below command: 
node index.js


Server listening on PORT 3000
  • Open your browser and go to http://localhost:3000/, now you can see the following output on your console: 
Server listening on PORT 3000
attachment; filename="Hello.txt"
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