var contacts = new Backbone.Collection([ {firstName: 'John',lastName: 'Doe',phone: '111-111-1111'}, {firstName: 'Jane',lastName: 'Doe',phone: '222-222-2222'}, ],{model:Backbone.Model}); console.log(JSON.stringify(contacts.toJSON())); //check current model attributes //add Bill Doe, Remove Jane Doe, Update John Doe contacts.set([ {firstName: 'Bill',lastName: 'Doe',phone: '333-333-3333'}, {firstName: 'Jane', middleName: 'Roe', lastName: 'Doe',phone: '555-555-5555'} ]); //verify changes console.log(JSON.stringify(contacts.toJSON()));