Add a property to a custom event definition
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Add a property to a custom event definition
with HubSpot
Works with AI assistants
Use HubSpot: its Hubspot Advanced API lets you add a property to a custom event definition in a single step (POST /events/v3/2026-09/event-definitions/{eventName}/property). HubSpot also has an MCP server, so an AI assistant like Claude or ChatGPT can do it for you. capabilities.work can help you get signed up and connected.
- How do I add a new property to a custom event I've already defined?
- Which data types can a custom event property use?
Say it to your AI assistant
- Add a {type} property labelled {label} to event definition {eventName}.
- Create enumeration property {label} on event {eventName} with options {options}.
For your developer
POST /events/v3/2026-09/event-definitions/{eventName}/property in Hubspot Advanced API. Full spec on APIs.io.