# Context scope and complex variables possible?
**URL:** https://discourse.nodered.org/t/context-scope-and-complex-variables-possible/76335
**Category:** General
**Created:** [9 March 2023 06:05 UTC](https://discourse.nodered.org/t/context-scope-and-complex-variables-possible/76335 "2023-03-09T06:05:03Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@dakky](https://discourse.nodered.org/u/dakky)
#### Post date: [9 March 2023 06:05 UTC](https://discourse.nodered.org/t/context-scope-and-complex-variables-possible/76335/1 "2023-03-09T06:05:03Z")
Hello I want to store a javascript object in the flow context scope to keep a state over different runs of a flow
Example:
```auto
{
"lastState": {
"device1": timestamp,
"device2": timestamp,
}
}
```
Something like this does not work (non wokring code):
```auto
var lastReset = flow.get("lastReset")
var device = msg.device
lastReset[device] = Date.now()
flow.set(lastReset)
return msg
```
`flow.set` expects a string?
Is this possible with a function node?
---
### Author:  [@UnborN](https://discourse.nodered.org/u/UnborN)
#### Post date: [9 March 2023 06:49 UTC](https://discourse.nodered.org/t/context-scope-and-complex-variables-possible/76335/2 "2023-03-09T06:49:59Z")
> [@dakky](#):
>
> `flow.set(lastReset)`
flow.set expects two arguments
the name (string) of the context variable and the value (your object in this case )
try
```auto
var lastReset = flow.get("lastReset")
var device = msg.device
lastReset[device] = Date.now()
flow.set("lastReset", lastReset )
return msg
```
you can read more about using Context in Function nodes [here](https://nodered.org/docs/user-guide/writing-functions#storing-data)
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [23 March 2023 06:50 UTC](https://discourse.nodered.org/t/context-scope-and-complex-variables-possible/76335/3 "2023-03-23T06:50:32Z")
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