Node JS Download File to Amazon AWS s3 Bucket

Download files to amazon AWS S3 bucket using Node js + express; Through this tutorial, you will learn how to download file to amazon s3 bucket using node js + express + aws-s3.

How to download file from S3 bucket using node js

Follow the below-given steps to download the file to amazon s3 bucket using node js + express:

• Step 1 – Create Node Express js App
• Step 2 – Install express, aws-s3, Multer dependencies
• Step 3 – Create Server.js File
  • Import Installed Packages
  • Create Route for Download File to AWS S3 using Node.js
• Step 4 – Start Node Express Js App Server

Step 1 – Create Node Express js App

Execute the following command on terminal to create node js app:

mkdir my-app
cd my-app
npm init -y

Step 2 – Install express, aws-s3 dependencies

Execute the following command on terminal to install express, aws-s3 dependencies:

npm install express aws-sdk --save

Express — Express is a minimal and flexible Node.js web application framework that provides a robust set of features for web and mobile applications.

AWS-SDK — AWS s3 npm is used to upload or delete an image from the s3 bucket with the help of some keys.

Step 3 – Create Server.js File

Create server.js file; so visit your app root directory and create a new file name server.js.

Then follow the below steps:

• Import Installed Packages
• Create Route for Download File to AWS S3 using Node.js

Import Installed Packages

Import above installed dependencies package in server.js file:

var aws = require('aws-sdk')
var express = require('express')

Create Route for Download File to AWS S3 using Node.js

The following node js rest api route will be download file to amazon s3 bucket:

app.get('/download-file', function(req, res, next){

    // download the file via aws s3 here
    var fileKey = req.query['fileKey'];

    console.log('Trying to download file', fileKey);
    
    AWS.config.update(
      {
        accessKeyId: "....",
        secretAccessKey: "...",
        region: 'ap-southeast-1'
      }
    );
    var s3 = new AWS.S3();
    var options = {
        Bucket    : '/bucket-url',
        Key    : fileKey,
    };

    res.attachment(fileKey);
    var fileStream = s3.getObject(options).createReadStream();
    fileStream.pipe(res);
});

Open your server js file and add the following code into it:

var express = require('express');
var app = express();
var AWS = require('aws-sdk');
var fs = require('fs');


app.get('/download-file', function(req, res, next){

    // download the file via aws s3 here
    var fileKey = req.query['fileKey'];

    console.log('Trying to download file', fileKey);
    
    AWS.config.update(
      {
        accessKeyId: "....",
        secretAccessKey: "...",
        region: 'ap-southeast-1'
      }
    );
    var s3 = new AWS.S3();
    var options = {
        Bucket    : '/bucket-url',
        Key    : fileKey,
    };

    res.attachment(fileKey);
    var fileStream = s3.getObject(options).createReadStream();
    fileStream.pipe(res);
});


app.listen(3000, function () {
   console.log('express is online');
})

Step 4 – Start Node Express Js App Server

Execute the following command on terminal to start node express js server:

//run the below command

npm start

Conclusion

Download files to Amazon AWS S3 bucket using Node js + express; Through this tutorial, you have learned how to download file to amazon s3 bucket using node js + express + aws-s3.

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