# Logical OR within mustache expression within data
**URL:** https://discourse.nodered.org/t/logical-or-within-mustache-expression-within-data/35173
**Category:** General
**Created:** [1 November 2020 17:38 UTC](https://discourse.nodered.org/t/logical-or-within-mustache-expression-within-data/35173 "2020-11-01T17:38:19Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@cburkins](https://discourse.nodered.org/u/cburkins)
#### Post date: [1 November 2020 17:38 UTC](https://discourse.nodered.org/t/logical-or-within-mustache-expression-within-data/35173/1 "2020-11-01T17:38:19Z")
Within the JSON portion (or "Data" field), you can obviously make use of a {{variable}} substitution. In my case, I'd like to reference msg.media\_player, unless it's not set, then default to flow.media\_player.
Obviously, I can add a node in front to handle that logic, but hoping to avoid the extra clutter. Most interpolation implementations offer this feature, so thinking Node-red has it ?
-Chad
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### Author:  [@E1cid](https://discourse.nodered.org/u/E1cid)
#### Post date: [1 November 2020 17:45 UTC](https://discourse.nodered.org/t/logical-or-within-mustache-expression-within-data/35173/2 "2020-11-01T17:45:00Z")
Call service node is a non standard HA node. So I dont have it installed. What other input options are there , does it have JSONata, or just string, number, json.
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### Author:  [@cburkins](https://discourse.nodered.org/u/cburkins)
#### Post date: [1 November 2020 17:46 UTC](https://discourse.nodered.org/t/logical-or-within-mustache-expression-within-data/35173/3 "2020-11-01T17:46:30Z")
JSON and JSONata
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### Author:  [@E1cid](https://discourse.nodered.org/u/E1cid)
#### Post date: [1 November 2020 17:49 UTC](https://discourse.nodered.org/t/logical-or-within-mustache-expression-within-data/35173/4 "2020-11-01T17:49:13Z")
Then use JSONata.
when i get home i'll post an example
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### Author:  [@cburkins](https://discourse.nodered.org/u/cburkins)
#### Post date: [1 November 2020 17:55 UTC](https://discourse.nodered.org/t/logical-or-within-mustache-expression-within-data/35173/5 "2020-11-01T17:55:21Z")
That's nice of you. I'm experimenting now, might be onto something
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### Author:  [@E1cid](https://discourse.nodered.org/u/E1cid)
#### Post date: [1 November 2020 17:58 UTC](https://discourse.nodered.org/t/logical-or-within-mustache-expression-within-data/35173/6 "2020-11-01T17:58:38Z")
```auto
{
"test": (payload ? payload : 1)
}
```
here a simple example.
If msg payload exists and not null, or default 1
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### Author:  [@cburkins](https://discourse.nodered.org/u/cburkins)
#### Post date: [1 November 2020 18:13 UTC](https://discourse.nodered.org/t/logical-or-within-mustache-expression-within-data/35173/7 "2020-11-01T18:13:52Z")
Success ! Thanks for the tip.
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [15 November 2020 18:13 UTC](https://discourse.nodered.org/t/logical-or-within-mustache-expression-within-data/35173/8 "2020-11-15T18:13:53Z")
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