Uploading and Image to an existing AWS S3 Bucket

s3Bucket.js

// File System node module.

var fs = require('fs');

// Amazon SDK node module.

var AWS = require('aws-sdk');

// Read a file in the project folder that contains your AWS credentials.
// On a production server, you would want to reference the credentials using environmental variables.

AWS.config.loadFromPath('config.json');

// Connect directly to a bucket, instantiating an AWS.S3 object by passing in the bucket name as a parameter.

var s3Bucket = new AWS.S3({ params: {Bucket: 'beverages'}});

// Asynchronously reads the entire contents of a file.
// The first argument is a String (filename) and the second a callback.
// The callback is passed two arguments (err, data), where data is the contents of the file.

fs.readFile('pepsi.jpg', function(err, imgFile) {

	if (err) throw err;

	// In order to upload an image, you can use the putObject method that takes 
	// a data and callback function as arguments. The data should contain a Key, Body and ContentType property. 
	// The Key should contain the name of the image, and the Body should contain the image file itself,
	// and the ContentType should contain the data media type (http://en.wikipedia.org/wiki/Internet_media_type).  
	// The callback function takes an error and data as arguments that you can use to check the status of the uploaded file.

	var img = {Key: "pepsi.jpg", Body: imgFile, ContentType: 'image/jpeg'};
	
	s3Bucket.putObject(img, function(err, data){
	    if (err) 
	    { console.log('Error: ', err.message); 
	    } else {
	      console.log('Image uploaded succesfully!');
	    }
	});

});