simple-sequelize-m2m.js

var Sequelize = require('sequelize');
var sequelize = new Sequelize('db','db_user','password');
var chainer = new Sequelize.Utils.QueryChainer

// define models
var User = sequelize.define('User', {name: Sequelize.STRING})

// build instances
var joe = User.build({name: 'Joe'});
var jane = User.build({name: 'Jane'});

// associations
// User.hasMany(User, {as: 'Children'}); // will NOT create a junction table
User.hasMany(User, {as: 'Children', through: 'Children'}); // will create a `Children` junction table

sequelize.sync().success(function(){
    chainer
        .add(joe.save())
        .add(jane.save())
        .add(joe.setChildren([jane]))
        .runSerially()
        .success(function(){ console.log('all good');})
        .error(function(err){ console.log(err);});
});