# \#custom-field-query

**URL:** https://integration.keap.com/tag/custom-field-query/335.md

[Latest](https://integration.keap.com/latest.md) · [Categories](https://integration.keap.com/categories.md) · [Tags](https://integration.keap.com/tags.md)

---

## [URGENT: Critical blocker for XML-RPC migration - Missing Custom Field search in REST API](https://integration.keap.com/t/urgent-critical-blocker-for-xml-rpc-migration-missing-custom-field-search-in-rest-api/93977)

<div class="topic-metadata">

**Author:** [@Massimo\_Romanello](https://integration.keap.com/u/Massimo_Romanello)\
**Replies:** 4\
**Last updated:** [July 16, 2026, 10:10pm UTC](https://integration.keap.com/t/urgent-critical-blocker-for-xml-rpc-migration-missing-custom-field-search-in-rest-api/93977 "2026-07-16T22:10:57Z")

</div>

Hi team, I’m currently working on migrating our integration from XML-RPC to the REST API ahead of the upcoming deprecation. However, I’ve identified a critical blocker regarding the ability to search by custom fields. S…

---

## [How to use DataService.query to Query on custom field](https://integration.keap.com/t/how-to-use-dataservice-query-to-query-on-custom-field/71088)

<div class="topic-metadata">

**Author:** [@Andrew\_Jimerson](https://integration.keap.com/u/Andrew_Jimerson)\
**Replies:** 2\
**Last updated:** [September 12, 2019, 12:20am UTC](https://integration.keap.com/t/how-to-use-dataservice-query-to-query-on-custom-field/71088 "2019-09-12T00:20:53Z")

</div>

I added a custom Field with name Demo I want to use "DataService.query " Api to get all those records who “Demo” (custom created field) is null. How can i user custom column name in the parameter of DataService.query