# Flowable Form - Expression Field : Conditional variable display

**URL:** <https://forum.flowable.org/t/flowable-form-expression-field-conditional-variable-display/5176>\
**Category:** Flowable Engine\
**Created:** [January 6, 2020, 3:57am UTC](https://forum.flowable.org/t/flowable-form-expression-field-conditional-variable-display/5176 "2020-01-06T03:57:37Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![wwitt](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.flowable.org/wwitt/32/706_2.png) [@wwitt](https://forum.flowable.org/u/wwitt)\
**Post date:** [January 6, 2020, 8:02pm UTC](https://forum.flowable.org/t/flowable-form-expression-field-conditional-variable-display/5176/2 "2020-01-06T20:02:02Z")

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Out of the box, the OSS forms engine provides basic input and output of a few supported datatypes. You can extend it or add additional features to a custom front end. This post seems like a good place to start

> [@Integrate external Forms web application](https://forum.flowable.org/t/integrate-external-forms-web-application/5178):
>
> I’m looking for having better UI when user input. Can Flowable access user input from external? For example, can I extend / modify any Java classes for get / set user input data which is stored from another database (or through api)?

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