# What are flexServerInternals and sandboxFlowContext variables

**URL:** <https://discourse.nodered.org/t/what-are-flexserverinternals-and-sandboxflowcontext-variables/81142>\
**Category:** General\
**Created:** [8 September 2023 13:02 UTC](https://discourse.nodered.org/t/what-are-flexserverinternals-and-sandboxflowcontext-variables/81142 "2023-09-08T13:02:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![denissanga](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/denissanga/32/48346_2.png) [@denissanga](https://discourse.nodered.org/u/denissanga)\
**Post date:** [8 September 2023 13:02 UTC](https://discourse.nodered.org/t/what-are-flexserverinternals-and-sandboxflowcontext-variables/81142/1 "2023-09-08T13:02:54Z")

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hi all I'm using opcua compact server node and in a tutorial there are the following command in the javascript code  
function constructAlarmAddressSpace(server,addressSpace,eventObjects,done){  
...  
...  
var flexServerInternals = this;  
this.sandboxFlowContext.set("isoInput1",0);

I would like learn more details about flexServerInternals and sandboxFlowContext in order to reach them outside node too  
many thanks in advance  
best regards

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [7 November 2023 13:03 UTC](https://discourse.nodered.org/t/what-are-flexserverinternals-and-sandboxflowcontext-variables/81142/2 "2023-11-07T13:03:45Z")

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