Javascript - How to work with the Browser debugger (Chrome, Firefox, …)

About

This article talks about the Javascript debugger present in the browser and shows you how to use it.

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Steps by Step

The debugger keyword

The first and easiest way to use the browser debugger is to add inside your Javascript the debugger keyword.

Steps:

• Add the debugger word in your code where you want your breakpoint. Example:

// code before
debugger;
// code after

• Open the devtool (if the devtool is opened after the page load, the HTML is not present and the debugger will not show the code while debugging)
• Refresh the page (F5)
• The debugger should stop and open the source tab on the line of the debugger keyword.

Add a breakpoint

You may also add a breakpoint by right clicking on the script line.