# New validations on function input query variables metafields — Shopify developer changelog --- ## New validations on function input query variables metafields As of 2025-01, input query variables metafields will now be subject to additional validation across all Function APIs. Previously, if these metafields didn't contain properly formatted data, we treated them as empty. This could lead to situations where it was difficult to determine why a function wasn't receiving the expected input data. Now, an invalid metafield will result in an `InvalidVariableValueError` when attempting to run the function. For more information, refer to the [list of errors](https://shopify.dev/docs/apps/build/functions/monitoring-and-errors#list-of-errors). *Published: January 06, 2025* Tags: API, Update Link: https://shopify.dev/changelog/new-validations-on-function-input-query-variables-metafields ---