---
title: "Online Store 2.0: New metafields type system and dynamic sources available - 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.
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  html: https://shopify.dev/changelog/online-store-2-0-new-metafields-type-system-and-dynamic-sources-available
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---

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

June 29, 2021

Tags:

* Themes
* 2021-10

# Online Store 2.0: New metafields type system and dynamic sources available

We've released a new commerce-oriented type system for metafields. Metafields created with these new types from our APIs will be more interoperable across our system.

The type system is exposed through a new `type` field. The `type` field replaces the `valueType` field, which is now deprecated, and will be removed in our 2021-10 release.

Most new types map to the old `MetafieldValueType` enum, except for `json_string` and `json`. `json` replaces `json_string`, but `json_string` will continue to exist because it behaves differently than the new `json` type when referenced in Liquid.

**Note**: `json_string` will not automatically migrate to the `json` type.

Learn more about the type system and how to migrate to it in the [Metafields documentation](https://shopify.dev/apps/metafields/definitions/types).

To learn more about these API changes, refer to our API reference documentation:

* [Admin REST reference](https://shopify.dev/docs/admin-api/rest/reference/metafield)
* [Admin GraphQL reference](https://shopify.dev/docs/admin-api/graphql/reference/metafields)
* [Storefront API reference](https://shopify.dev/docs/storefront-api/reference/common-objects/metafield)