> For the complete documentation index, see [llms.txt](https://v5docs.keyfax.biz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://v5docs.keyfax.biz/script-data/testing-databoxes-and-expressions.md).

# Testing databoxes and expressions

Trying a databox or an expression on its own, with values you choose, before a conversation depends on it.

**This page will cover**

* Running a databox with test values
* Reading the result, and the errors you may see
* Testing an expression in isolation
* Common mistakes and what they look like