# Question of Logic Expression

**URL:** <https://forum.inductiveautomation.com/t/question-of-logic-expression/28072>\
**Category:** Ignition\
**Created:** [September 6, 2019, 8:46am UTC](https://forum.inductiveautomation.com/t/question-of-logic-expression/28072 "2019-09-06T08:46:38Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Min.Liao](https://avatars.discourse-cdn.com/v4/letter/m/96bed5/32.png) [@Min.Liao](https://forum.inductiveautomation.com/u/Min.Liao)\
**Post date:** [September 6, 2019, 8:46am UTC](https://forum.inductiveautomation.com/t/question-of-logic-expression/28072/1 "2019-09-06T08:46:38Z")

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Hi,  
Can I write the below expression:  
if(jsonGet(’{A}’,‘B’) ==true&jsonGet(’{C}’,‘D’) == false,true,false)  
If not, how can I write it?  
Thank you!

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<div class="post-metadata">

**Author:** ![dkhayes117](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/dkhayes117/32/68344_2.png) [@dkhayes117](https://forum.inductiveautomation.com/u/dkhayes117)\
**Post date:** [September 6, 2019, 12:07pm UTC](https://forum.inductiveautomation.com/t/question-of-logic-expression/28072/2 "2019-09-06T12:07:45Z")

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for the and part use && not &, the equals should be = not ==

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<div class="post-metadata">

**Author:** ![cmallonee](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/cmallonee/32/6416_2.png) [@cmallonee](https://forum.inductiveautomation.com/u/cmallonee)\
**Post date:** [September 6, 2019, 2:39pm UTC](https://forum.inductiveautomation.com/t/question-of-logic-expression/28072/3 "2019-09-06T14:39:26Z")

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You’re also making the expression more complicated than it needs to be:

```auto
jsonGet(’{A}’,‘B’)=true && jsonGet(’{C}’,‘D’)=false

```

You don’t need the `if` wrapper when you are just returning boolean values - save it for when you need to return something more complicated.

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<div class="post-metadata">

**Author:** ![Min.Liao](https://avatars.discourse-cdn.com/v4/letter/m/96bed5/32.png) [@Min.Liao](https://forum.inductiveautomation.com/u/Min.Liao)\
**Post date:** [September 9, 2019, 9:06am UTC](https://forum.inductiveautomation.com/t/question-of-logic-expression/28072/4 "2019-09-09T09:06:14Z")

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Thank you for your help.