s3-get.js

// Load the AWS SDK for Node.js
var AWS = require('aws-sdk');

// Set the region
AWS.config.update({ region: 'eu-west-1' });

// Create S3 service object
var s3 = new AWS.S3({ apiVersion: '2006-03-01' });

var params = {
  Bucket: 'whosebucketisitanyway',
  Key: 'hello-world.txt'
};

s3.getObject(params, function (err, data) {
  if (err) console.log(err, err.stack); // an error occurred
  else console.log(data.Body.toString()); // successful response
  /*
     data = {
      AcceptRanges: "bytes",
      ContentLength: 3191,
      ContentType: "image/jpeg",
      ETag: "\"6805f2cfc46c0f04559748bb039d69ae\"",
      LastModified: <Date Representation>,
      Metadata: {
      },
      TagCount: 2,
      VersionId: "null"
     }
     */
});