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debugger Keyword

Site: Saylor Academy
Course: PRDV401: Introduction to JavaScript I
Book: debugger Keyword
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Date: Wednesday, May 14, 2025, 10:48 AM

Table of contents

debugger Keyword

The debugger statement invokes any available debugging functionality, such as setting a breakpoint. If no debugging functionality is available, this statement has no effect.

Syntax

debugger;

Examples

Using the debugger statement

The following example shows code where a debugger statement has been inserted, to invoke a debugger (if one exists) when the function is called. 

function potentiallyBuggyCode() {
  debugger;
  // do potentially buggy stuff to examine, step through, etc.
}

When the debugger is invoked, execution is paused at the debugger statement. It is like a breakpoint in the script source.