Property validation rules are enforced on API record writes from version 2026-09: a value that fails a rule returns 400 Property values were not valid (for example FAILS_REGEX_MATCH).
Documented and measured
More facts from this area
- Each object can have up to 1,000 custom properties.Source pending
- A property's
name,typeandhasUniqueValuecan't be changed after it is created.Source pending - HubSpot's default
industryproperty is an enumeration, not a free-text field.Measured - HubSpot keeps sparse option
displayOrdervalues as sent on create (5, 1, 9), and a PATCH oflabel,descriptionoroptionsdoesn't renumber the remaining options.Measured - Removing an option that records hold succeeds, and the records keep the value (search still finds it, no history entry); re-adding the option makes it valid again with no record write.Measured
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