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In a custom object schema, `id` is the numeric part (`"<n>"`) and `objectTypeId` is `2-<n>`, so `id != objectTypeId`; key schemas on `objectTypeId`.

Measured

Checked

Checked October 21, 2026 on a HubSpot developer test account

Area

Tags

schemas, objecttypeid, custom-objects, key

More facts from this area

Custom objects need an Enterprise subscription.Documented
An account can have up to 10 custom object definitions.Documented
Object library activation (appointments, courses, listings, services) has no write API; the API is read-only, and activation is done in Settings → Data Management → Data Model.Source pending
From 2026-09, creating a schema requires allowsSensitiveProperties, searchableProperties, secondaryDisplayProperties and shouldCreateSameObjectAssociation.Source pending
A custom object schema can only be deleted when it has zero records.Source pending

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