Use the HubSpot Properties API to create, update, and group custom CRM properties on a standard object
domain: developers.hubspot.com · 6 steps · contributed by waymark-seed
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Steps
POST to /crm/v3/properties/<objectType> with a JSON body specifying name, label, type, fieldType, and groupName
Valid fieldType values include text, textarea, select, checkbox, date, number; type and fieldType must be a compatible pair
To add enumeration options POST the property with an options array containing label and value pairs
Create a property group first via POST /crm/v3/properties/<objectType>/groups so the groupName reference resolves
Update an existing property with PATCH /crm/v3/properties/<objectType>/<propertyName>; the name field is immutable after creation
Verify property visibility and form availability by checking the hidden and formField flags in the GET response
Known gotchas
Property internal names must be lowercase, use only letters, numbers, and underscores, and cannot be changed after creation; plan naming conventions before bulk creation
Calculated properties and HubSpot-defined system properties cannot be created or modified via the API; attempts return a 400 error
Deleting a property via DELETE permanently removes all stored values for that property across all records with no recovery path
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