# Is it possible to use a flow variable as a value in a JSON string?

**URL:** <https://discourse.nodered.org/t/is-it-possible-to-use-a-flow-variable-as-a-value-in-a-json-string/10377>\
**Category:** General\
**Created:** [20 April 2019 09:59 UTC](https://discourse.nodered.org/t/is-it-possible-to-use-a-flow-variable-as-a-value-in-a-json-string/10377 "2019-04-20T09:59:05Z")\
**Posts on this page:** 7\
**Page:** 2

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**Author:** ![simonk83](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/simonk83/32/7651_2.png) [@simonk83](https://discourse.nodered.org/u/simonk83)\
**Post date:** [20 April 2019 12:20 UTC](https://discourse.nodered.org/t/is-it-possible-to-use-a-flow-variable-as-a-value-in-a-json-string/10377/21 "2019-04-20T12:20:57Z")

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Oh god, worked it out, phew!

For any other poor soul reading this in the future, I ended up with this:

A template node containing `{"data" : { "value" : {{flow.MinCool}} } }` which feeds directing into the call service node and populates the Data field automatically.

OK I need to go to sleep now haha. Thanks everyone for your help and suggestions as always!

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**Author:** ![juancuellar](https://avatars.discourse-cdn.com/v4/letter/j/a9a28c/32.png) [@juancuellar](https://discourse.nodered.org/u/juancuellar)\
**Post date:** [18 February 2020 19:20 UTC](https://discourse.nodered.org/t/is-it-possible-to-use-a-flow-variable-as-a-value-in-a-json-string/10377/22 "2020-02-18T19:20:24Z")

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Hi i have the same issue but i havent quite got it to work what are the settings you are using on the template node

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<div class="post-metadata">

**Author:** ![juancuellar](https://avatars.discourse-cdn.com/v4/letter/j/a9a28c/32.png) [@juancuellar](https://discourse.nodered.org/u/juancuellar)\
**Post date:** [18 February 2020 19:29 UTC](https://discourse.nodered.org/t/is-it-possible-to-use-a-flow-variable-as-a-value-in-a-json-string/10377/23 "2020-02-18T19:29:49Z")

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This is what i have so far

```auto
[{"id":"540aef05.e9bfb","type":"api-call-service","z":"a1c0be48.ec3b9","name":"Snapshot full","server":"9c52e9c6.678398","version":1,"debugenabled":true,"service_domain":"hassio","service":"snapshot_full","entityId":"","data":"","dataType":"json","mergecontext":"","output_location":"payload","output_location_type":"msg","mustacheAltTags":false,"x":550,"y":100,"wires":[["1620aef0.314851"]]},{"id":"ea93648c.8440a8","type":"inject","z":"a1c0be48.ec3b9","name":"Backup","topic":"","payload":"true","payloadType":"bool","repeat":"","crontab":"00 02 * * 0","once":false,"onceDelay":0.1,"x":100,"y":100,"wires":[["b6100085.089dd"]]},{"id":"1620aef0.314851","type":"debug","z":"a1c0be48.ec3b9","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":710,"y":100,"wires":[]},{"id":"b6100085.089dd","type":"function","z":"a1c0be48.ec3b9","name":"","func":"msg.name = \"Backup \" + Date().toString();\nreturn msg;","outputs":1,"noerr":0,"x":250,"y":100,"wires":[["f02a7c41.4c626"]]},{"id":"f02a7c41.4c626","type":"template","z":"a1c0be48.ec3b9","name":"name","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"{\"data\" : { \"name\" : {{msg.name}} } }","output":"str","x":390,"y":100,"wires":[["540aef05.e9bfb"]]},{"id":"9c52e9c6.678398","type":"server","z":"","name":"Home Assistant"}]

```

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<div class="post-metadata">

**Author:** ![juancuellar](https://avatars.discourse-cdn.com/v4/letter/j/a9a28c/32.png) [@juancuellar](https://discourse.nodered.org/u/juancuellar)\
**Post date:** [18 February 2020 20:31 UTC](https://discourse.nodered.org/t/is-it-possible-to-use-a-flow-variable-as-a-value-in-a-json-string/10377/24 "2020-02-18T20:31:54Z")

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So if anyone is interested i got to work like this

```auto
[{"id":"540aef05.e9bfb","type":"api-call-service","z":"a1c0be48.ec3b9","name":"Snapshot full","server":"9c52e9c6.678398","version":1,"debugenabled":true,"service_domain":"hassio","service":"snapshot_full","entityId":"","data":"{}","dataType":"json","mergecontext":"","output_location":"payload","output_location_type":"msg","mustacheAltTags":true,"x":550,"y":100,"wires":[[]]},{"id":"ea93648c.8440a8","type":"inject","z":"a1c0be48.ec3b9","name":"Backup","topic":"","payload":"true","payloadType":"bool","repeat":"","crontab":"00 02 * * 0","once":false,"onceDelay":0.1,"x":100,"y":100,"wires":[["b6100085.089dd"]]},{"id":"b6100085.089dd","type":"function","z":"a1c0be48.ec3b9","name":"","func":"msg.payload = \"Backup \" + Date().toString();\nreturn msg;","outputs":1,"noerr":0,"x":250,"y":100,"wires":[["72a98633.54c208"]]},{"id":"72a98633.54c208","type":"template","z":"a1c0be48.ec3b9","name":"name","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"{\n \"data\":{\"name\" : \"{{{payload}}}\" }\n }","output":"json","x":390,"y":100,"wires":[["540aef05.e9bfb"]]},{"id":"9c52e9c6.678398","type":"server","z":"","name":"Home Assistant"}]

```

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<div class="post-metadata">

**Author:** ![kobudev](https://avatars.discourse-cdn.com/v4/letter/k/9e8a1a/32.png) [@kobudev](https://discourse.nodered.org/u/kobudev)\
**Post date:** [26 April 2020 14:40 UTC](https://discourse.nodered.org/t/is-it-possible-to-use-a-flow-variable-as-a-value-in-a-json-string/10377/25 "2020-04-26T14:40:47Z")

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Thanks a lot, this worked for me!

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<div class="post-metadata">

**Author:** ![juancuellar](https://avatars.discourse-cdn.com/v4/letter/j/a9a28c/32.png) [@juancuellar](https://discourse.nodered.org/u/juancuellar)\
**Post date:** [26 April 2020 15:49 UTC](https://discourse.nodered.org/t/is-it-possible-to-use-a-flow-variable-as-a-value-in-a-json-string/10377/26 "2020-04-26T15:49:33Z")

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no porb have a great day

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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:** [10 May 2020 15:49 UTC](https://discourse.nodered.org/t/is-it-possible-to-use-a-flow-variable-as-a-value-in-a-json-string/10377/27 "2020-05-10T15:49:42Z")

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