---
title: Reserved prefix protection for metafields and metaobjects - Shopify developer changelog
description: Shopify’s developer changelog documents all changes to Shopify’s platform. Find the latest news and learn about new platform opportunities.
source_url:
  html: https://shopify.dev/changelog/reserved-prefix-protection-for-metafields-and-metaobjects
  md: https://shopify.dev/changelog/reserved-prefix-protection-for-metafields-and-metaobjects.md
---

[Back to Developer changelog](https://shopify.dev/changelog)

February 19, 2025

Tags:

* Admin GraphQL API
* Admin REST API
* Customer Account API
* 2025-04

# Reserved prefix protection for metafields and metaobjects

Starting today, [reserved prefixes](https://shopify.dev/docs/apps/build/custom-data/ownership#reserved-prefixes) have been widened to include any phrase. You can no longer make any metafield namespace or metaobject type that includes `--` (e.g., `foo--` , `foo--bar` ). This only affects new metafield and metaobject definitions; existing definitions will continue to work as before. This change is intended to reserve the `--` format for platform defined features such as `shopify--{standard}` and `app--{your-app-id}`.