HubSpot Developer Changelog

Changes to Serverless Function Error Responses

Announced: July 3, 2025

We are updating the error responses for Serverless Functions to provide more accurate status codes when issues originate from your Serverless Function code. Previously, some Serverless Functions that contained errors in their code were incorrectly...

The HubSpot MCP Server - available in Public Beta

Live: May 6, 2025

The HubSpot MCP server is now available in public beta. It allows AI clients such as Cursor and Claude to interact with HubSpot data and unlocks powerful integration possibilities.

April 2025 Rollup

Announced: May 1, 2025

This month's updates bring several enhancements for developers. You can now access the hosting region of a HubSpot Account directly within UI Extensions using the Context object. We've also introduced the ability to host HubSpot content on a...

CDN path for static assets (CSS & JavaScript) changing

Live: February 12, 2025

We're updating the paths for design manager assets, including CSS and JS files. The paths will change from hs-fs/hub/* to hs-fs/hubfs/*.

CRM Imports API - New validation for Required Properties

Live: January 20, 2025

CRM objects often have properties that are required for creating records of that object type. For example Deals, require a Deal Name. When using the CRM Imports API, we're going to start validating that the provided import Request contains the...

Sandboxes and CLI sandbox commands

Live: September 10, 2024

To prepare foundational work needed to deliver reliable and scalable upcoming sandbox features, we're making changes to the CLI's standard sandboxes and development sandboxes creation and sync experience in the CLI (Command Line Interface) and UI...

August 2024 Rollup

Announced: August 29, 2024

It's the last rollup before INBOUND! This month we have CLI updates, new contact properties, UI Extension beta updates, and email subscription API updates. HubSpot CLI v5.4

Sites using polyfill.io on HubSpot were rewritten to use Cloudflare's version

Live: July 15, 2024

URLs for a popular polyfill service (polyfill.io) began serving malicious code after years of serving safe polyfill scripts. Web developers use polyfills to add backward compatibility for newer browser APIs. None of HubSpot's default assets use...

Ending Support for HubSpot CLI Versions Below 6.0.0

Live: October 1, 2025

We will be officially ending support for all HubSpot CLI versions below 6.0.0. This will improve security, reliability, and compatibility with our developer platform and other developer tooling for our developer community.

Marketing Email API: v3 released to general availability and upcoming sunset for v1

Live: October 1, 2025

Today we're announcing changes for the two versions of the Marketing Emails API.

Deprecation of Node v18 in all serverless functions and CLI

Live: October 1, 2025

Node.js v18 will reach end of life on April 30th, 2025. To make sure HubSpot systems stay up to date on security and reliability, we will be ending support for Node.js v18 on Oct 1, 2025. After this date, any existing functions using v18 will...

Update for Legacy CTA Editor Sunset

Live: November 30, 2025

We have an essential update on the scope and timeline of a previously announced Legacy CTA sunset. Starting September 1st, 2025, all new CTAs must be created using the new CTA editor. Existing Legacy CTAs that have already been created will continue...

Upcoming Sunset of Clearbit’s Free Logo API

Live: December 1, 2025

In December 2023, Clearbit was acquired by HubSpot, marking the beginning of an exciting new chapter for both companies. Since then, the Clearbit team has fully integrated into HubSpot, combining our expertise with HubSpot’s resources to better...

Breaking Change: Enhanced Validations for Non-String Properties in HubSpot's CRMObject APIs

Live: November 10, 2025

Starting November 10th, 2025, HubSpot will implement enhanced validations for non-string property values, including enumeration and multi-value enumeration property values submitted via the CRMObject APIs. This change aims to improve data integrity...

Reminder: Breaking Change for Enhanced Validations for Non-String Properties in HubSpot's CRMObject APIs

Live: November 10, 2025

Starting November 10, 2025, HubSpot will introduce enhanced validation rules for non-string property values, including enumeration and multi-value enumeration submitted via the CRMObject APIs. This change aims to improve data integrity and user...

Update: Legacy CTA Sunset

Live: November 30, 2025

Attention: We've recently revised our timeline on March 25th, 2025. For the most current details regarding this change, please check the latest updates in our changelog. Based on community feedback, we have updated our approach to transitioning from...

Upcoming Sunset: V1 Contact Lists API

Live: September 30, 2025

Edit: we have extended the sunset date from May 30, 2025 to September 30, 2025 to allow more time for migrations. The below has been updated to reflect this change. What’s changing? The V1 Contact Lists API will sunset on September 30, 2025. After...

Legacy CTA Sunset Timeline and Scope Update

Live: November 30, 2025

Attention: We've recently revised our timeline on March 25th, 2025. For the most current details regarding this change, please check the latest updates in our changelog.

Upcoming Sunset: Legacy CTAs

Live: November 30, 2025

Attention: We've recently revised our timeline on March 25th, 2025. For the most current details regarding this change, please check the latest updates in our changelog. We are sunsetting the Legacy CTAs (Call-To-Action) app and migrating it into a...

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Latest Posts

Changes to Serverless Function Error Responses

The HubSpot MCP Server - available in Public Beta

April 2025 Rollup

CDN path for static assets (CSS & JavaScript) changing

CRM Imports API - New validation for Required Properties

Sandboxes and CLI sandbox commands

August 2024 Rollup

Sites using polyfill.io on HubSpot were rewritten to use Cloudflare's version

Ending Support for HubSpot CLI Versions Below 6.0.0

Marketing Email API: v3 released to general availability and upcoming sunset for v1

Deprecation of Node v18 in all serverless functions and CLI

Update for Legacy CTA Editor Sunset

Upcoming Sunset of Clearbit’s Free Logo API

Breaking Change: Enhanced Validations for Non-String Properties in HubSpot's CRMObject APIs

Reminder: Breaking Change for Enhanced Validations for Non-String Properties in HubSpot's CRMObject APIs

Update: Legacy CTA Sunset

Upcoming Sunset: V1 Contact Lists API

Legacy CTA Sunset Timeline and Scope Update

Upcoming Sunset: Legacy CTAs