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debugger - JavaScript | MDN
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debugger
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
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
js
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.
js
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.
Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-debugger-statement |
Browser compatibility
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See also
- The Firefox JavaScript Debugger¶ in the Firefox source docs