How to upload a file to amazon Glacier using Nodejs?

I found this example on the amazon aws docs.

var glacier = new AWS.Glacier(),
    vaultName = 'YOUR_VAULT_NAME',
    buffer = new Buffer(2.5 * 1024 * 1024); // 2.5MB buffer

var params = {vaultName: vaultName, body: buffer};
glacier.uploadArchive(params, function(err, data) {
  if (err) console.log("Error uploading archive!", err);
  else console.log("Archive ID", data.archiveId);
});

But I don't understand where my file goes, or how to send it to the glacier servers?

The file is stored in the vaultName, what ever value you provide there. The data.archiveId is the representation of the file. The body is the file it self.

Here is a more general overview of Glacier

Q: How is data within Amazon Glacier organized?

Q: How do vaults work?

Q: What is an archive?

Cody Example: (As provided by hitautodestruct)

var AWS = require('aws-sdk'),
    fs = require('fs'),
    glacier = new AWS.Glacier(),
    vaultName = 'YOUR_VAULT_NAME',
    // No more than 4GB otherwise use multipart upload
    file = fs.readFileSync('FILE-TO-UPLOAD.EXT');

var params = {vaultName: vaultName, body: file};
glacier.uploadArchive(params, function(err, data) {
    if (err) console.log("Error uploading archive!", err);
    else console.log("Archive ID", data.archiveId);
});