HubSpot App Builder (Platform 2026.03)

This skill guides the development of full HubSpot apps on the latest developer platform (version 2026.03), covering project creation, configuration, UI extensions, serverless functions, webhooks, and distribution.

Platform version 2026.03 was released on March 30, 2026. It re-introduces full serverless function support for apps (including static-auth apps). Previous version 2025.2 is now in "Supported" status.

Prerequisites

• HubSpot CLI v8.3.0+: npm install -g @hubspot/cli@latest
• Authenticate: hs account auth
• Node.js 20+ (minimum raised from 18 in 2025.1)
• A HubSpot developer account
• Enterprise subscription required for production serverless functions (developer test accounts work without)

Project Setup Workflow

1. Create the Project