# writeBlocking only write last tag of array

**URL:** <https://forum.inductiveautomation.com/t/writeblocking-only-write-last-tag-of-array/31899>\
**Category:** Ignition\
**Created:** [February 4, 2020, 10:20am UTC](https://forum.inductiveautomation.com/t/writeblocking-only-write-last-tag-of-array/31899 "2020-02-04T10:20:49Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![mori.luca](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/mori.luca/32/13424_2.png) [@mori.luca](https://forum.inductiveautomation.com/u/mori.luca)\
**Post date:** [February 4, 2020, 12:54pm UTC](https://forum.inductiveautomation.com/t/writeblocking-only-write-last-tag-of-array/31899/8 "2020-02-04T12:54:20Z")

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Think i found what i need here :

> [@jsonSet workaround in script](http://forum.inductiveautomation.com/t/jsonset-workaround-in-script/27560):
>
> Hi, I have a lot of OPC tags, each OPC tags are “Documentation” type with UDT. Want to update some values of struct member of UDT for these OPC tags through buttons in a template pop out window. I could pass the UDT structure (json format data) to the pop out window template and use jsonGet function to parse the UDT data in the pop out window. I want to use the jsonSet function to set some struct member of UDT data in the popped window but it seems that the jsonSet function doesn’t work in t…

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