JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://underscorejs.org/underscore-min.js"></script>
<script src="http://backbonejs.org/backbone-min.js"></script>

JavaScript

var M=Backbone.Model.extend({
    url: '/echo/json/',
    
    save: function(attrs, options) {
        options || (options = {});
        
        options.contentType = 'application/json';
        options.data = JSON.stringify(attrs);
        
        Backbone.Model.prototype.save.call(this, attrs, options);
    }
});

var m=new M({
    'attr':'do not save'
});

m.save({author: "Teddy"});