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Showing content from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/debugger below:

debugger - JavaScript | MDN

debugger

Baseline Widely available

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 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.

Specifications Browser compatibility See also

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