How to check whether custom field exists?

[Anonymous]

Hello,
i need to check whether custom field is defined in the system.
I know if I fet lead by getLead, it returns only fields that are not null. Also at the check time I dont have specific email,
so I'm intersted in request that returns Lead metadata.

Thanks.

[Anonymous]

Have you tried the describeMbject call on the lead record object? 

[Anonymous]

Jim is correct if you want to get the list of fields via API.  You can also export the API accessible fields in Marketo->Admin->Field Management->Export Fields

[Anonymous]

got it,
Thank you!