Set a breakpoint in XHR in Chrome?

You can just set a breakpoint in the success callback and step through the debugger. To set a breakpoint: Open "Developer Tools", and click the "Scripts" tab on the top Select the script that contains the success callback for your AJAX request Click the line number on the left hand side where you want the breakpoint. A blue arrow will show up indicating the breakpoint has been set Then make the AJAX request as you would, and the debugger will automatically stop at the breakpoint you set Alternatively, you can use the debugger statement to automatically invoke the debugger.So with this your success callback may look like: success: function(data, textStatus, request) { debugger; // pause execution and opens debugger at this point ... } Also checkout this nice article for debugging JavaScript However, the first approach is better as it doesn't require you to modify your code.

You can just set a breakpoint in the success callback and step through the debugger. To set a breakpoint: Open "Developer Tools", and click the "Scripts" tab on the top. Select the script that contains the success callback for your AJAX request.

Click the line number on the left hand side where you want the breakpoint. A blue arrow will show up indicating the breakpoint has been set. Then make the AJAX request as you would, and the debugger will automatically stop at the breakpoint you set.

Alternatively, you can use the debugger statement to automatically invoke the debugger. So with this your success callback may look like: success: function(data, textStatus, request) { debugger; // pause execution and opens debugger at this point ... } Also checkout this nice article for debugging JavaScript. However, the first approach is better as it doesn't require you to modify your code.

Thank you for the well thought out answer. The debugger statement definitely got me a lot closer. I edited my question to clarify that I don't actually have a callback function defined so setting a breakpoint with debugger seems to be the only option.

– delivarator Jul 15 '10 at 18:30.

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