# Changes to Ajax API Cart token format  — Shopify developer changelog
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## Changes to Ajax API Cart token format 

Ajax API cart tokens will now be returned with a new format. The new format will include a prefix `c1-` however the API features and functionality remain unchanged. **Apps and themes should be designed to handle cart tokens in any format and of any length**. Treat the cart token as a random identifier that will change in the future.

**Action Required:**
Ensure that any app and theme code is free from hard-coded assumptions (ex. Using regex to identify a cart token) on the format and structure of the cart token.

*Published: July 17, 2023*
Tags: API, Update
Link: https://shopify.dev/changelog/changes-to-ajax-api-cart-token-format

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