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# September 2, 2026

## Custom event properties

Define your own properties for events and send their values with each event.

* Create, list, rename, retype, and delete custom event property definitions with `/events/custom-properties/`. Deleting a property that's in use requires `force=true`.
* Send property values in the new `properties` field on `POST /events/`. Values are type-checked against their definitions.

See [Custom event properties](/docs/events#custom-event-properties).