https://community.hubspot.com/t5/APIs-Integrations/Clearing-Contact-Property-fields/m-p/234523#M13419 <P><A class="mention" href="https://community.hubspot.com/u/kevinmannix">@kevinmannix</A> You can just use an empty string in your request. Here is a copy of the body I used.</P> <PRE><CODE>{ "properties": [ { "property": "firstname", "value": "" } ] } </CODE></PRE> <P>Here is the history as proof of the change</P> <P></P><DIV class="lightbox-wrapper"><A class="lightbox" href="https://community.hubspot.com/legacyfs/online/uploads/default/original/1X/d8f8763baeb403100fecaf83e858a6c0766c6c78.png" data-download-href="/legacyfs/online/uploads/default/d8f8763baeb403100fecaf83e858a6c0766c6c78" title="Pasted image"><IMG src="https://community.hubspot.com/legacyfs/online/uploads/default/optimized/1X/d8f8763baeb403100fecaf83e858a6c0766c6c78_1_690x312.png" width="690" height="312" /><DIV class="meta"> <SPAN class="filename">Pasted image</SPAN><SPAN class="informations">995x451 18.1 KB</SPAN><SPAN class="expand"></SPAN> </DIV></A></DIV><P></P> Tue, 29 Nov 2016 16:09:17 GMT 3PETE 2016-11-29T16:09:17Z