Building Scalable Apps with Redis and Node.js

Debugging

Breakpoints are a developer's best friend. They are much more useful than using console.log() everywhere. We will explore how to set a breakpoint on both the front and backend.

Frontend debugging

First up is frontend debugging. Before we can do this, we must create some JavaScript to debug. Create a new directory named static with a file named debug.js in the directory. Here is the code that will be in debug.js.

(function(){
  var body = document.body;
  (function(){
    var div = document.createElement('div');
    body.appendChild(div);
  })();

})();

Two simple self-executing functions (to create different scopes) that will add a div to the page. Nothing exciting here. Next, we must add this script to our response. Open up app.js and add or change the ...