JavaScript debugger
Example
With the debugger turned on, this code should stop executing before the third line:
let x = 15 * 5;
debugger;
document.getElementbyId("demo").innerHTML = x;
Try it Yourself »
Description
The debugger
statement stops the execution of JavaScript, and calls the debugger.
Note
If no debugging is available, the debugger statement has no effect.
Read our JavaScript Debugging Tutorial for more information about how to activate debugging if your browser.
Normally, you activate debugging in your browser with the F12 key, and select "Console" in the debugger menu.
Syntax
debugger;
Browser Support
debugger
is an ECMAScript1 (ES1) feature.
ES1 (JavaScript 1997) is fully supported in all browsers:
Chrome | Edge | Firefox | Safari | Opera | IE |
Yes | Yes | Yes | Yes | Yes | Yes |