# Vega Debug / log

**URL:** <https://discuss.elastic.co/t/vega-debug-log/150817>\
**Category:** Kibana\
**Created:** [October 3, 2018, 5:36am UTC](https://discuss.elastic.co/t/vega-debug-log/150817 "2018-10-03T05:36:37Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![thekm1](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/thekm1/32/35926_2.png) [@thekm1](https://discuss.elastic.co/u/thekm1)\
**Post date:** [October 3, 2018, 5:36am UTC](https://discuss.elastic.co/t/vega-debug-log/150817/1 "2018-10-03T05:36:37Z")

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Hi folks, a question to the logging with vega.  
If i declare a fieldname as value for an option (example : transform.groupby) and this field does not exist, will vega throw a log ? And how is it possible to see those logs ?

Thank you for helping

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**Author:** ![rashmi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rashmi/32/16391_2.png) [@rashmi](https://discuss.elastic.co/u/rashmi)\
**Post date:** [October 11, 2018, 10:32am UTC](https://discuss.elastic.co/t/vega-debug-log/150817/2 "2018-10-11T10:32:23Z")

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@nyuriks can you please help here?

Thanks  
Rashmi

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [November 8, 2018, 10:32am UTC](https://discuss.elastic.co/t/vega-debug-log/150817/3 "2018-11-08T10:32:24Z")

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