You can do this in Fiddler using the following steps.
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Locate the request in fiddler that relates to the post – you should be able to see the URL you expect in the URL column.
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Select that line and the detailed view will open. There is a WebForms tab (inside “Inspectors”) that displays the POST data in a neat table. You can also see it in the Raw tab, but it isn’t nicely formatted like the WebForms tab.
I have made a screenshot to help you:
