node package manager


ARFF data file tools

ARFF Tools for node.js

See the WEKA wiki for details on the file format.


First, install node.js and get the node-arff NPM module using npm:

$ npm install node-arff

Then, get yourself an ARFF file ( has a few) to read.

var arff = require('node-arff');
arff.load('data/some-file.arff', function(errdata) {
  if (err) {
    return console.error(err);
  // find out some info about the field "age" 
  var oldest = data.max('age');
  var youngest = data.min('age');
  var mostcommon = data.mode('age');
  var average = data.mean('age');
  // normalize the data (scale all numeric values so that they are between 0 and 1) 
  // randomly sort the data