# Concatenation inside formatting

**URL:** <https://discourse.nodered.org/t/concatenation-inside-formatting/60827>\
**Category:** General\
**Created:** [5 April 2022 12:37 UTC](https://discourse.nodered.org/t/concatenation-inside-formatting/60827 "2022-04-05T12:37:58Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![FeliceM](https://avatars.discourse-cdn.com/v4/letter/f/ec9cab/32.png) [@FeliceM](https://discourse.nodered.org/u/FeliceM)\
**Post date:** [5 April 2022 12:37 UTC](https://discourse.nodered.org/t/concatenation-inside-formatting/60827/1 "2022-04-05T12:37:58Z")

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Not being a coder I lack some skills....

How to you concatenate a variable with a string in this context (function).  
I am trying to concatenate VTS which is a float with VC1 which is a string

VTS=(k[9])  
msg.payload ={VTS + 'VC1':k[1]}

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<div class="post-metadata">

**Author:** ![E1cid](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/e1cid/32/77971_2.png) [@E1cid](https://discourse.nodered.org/u/E1cid)\
**Post date:** [5 April 2022 12:47 UTC](https://discourse.nodered.org/t/concatenation-inside-formatting/60827/2 "2022-04-05T12:47:35Z")

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> [@FeliceM](#):
>
> msg.payload ={VTS + 'VC1':k[1]}

```auto
msg.payload[VTS + "VC1"] = k[1];
or
msg.payload = {[VTS + "VC1"]: k[1]};

```

one adds a property to payload, the other over writes payload.  
[edit] I would add that a property name with a `.` in may cause issues later on, so might be better to avoid this.

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<div class="post-metadata">

**Author:** ![FeliceM](https://avatars.discourse-cdn.com/v4/letter/f/ec9cab/32.png) [@FeliceM](https://discourse.nodered.org/u/FeliceM)\
**Post date:** [5 April 2022 12:52 UTC](https://discourse.nodered.org/t/concatenation-inside-formatting/60827/3 "2022-04-05T12:52:38Z")

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Thank you!

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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:** [19 April 2022 12:52 UTC](https://discourse.nodered.org/t/concatenation-inside-formatting/60827/4 "2022-04-19T12:52:56Z")

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