# How do save JSON values that I'm receiving for MQTT protocol?

**URL:** <https://discourse.nodered.org/t/how-do-save-json-values-that-im-receiving-for-mqtt-protocol/58337>\
**Category:** General\
**Tags:** mqtt\
**Created:** [14 February 2022 19:21 UTC](https://discourse.nodered.org/t/how-do-save-json-values-that-im-receiving-for-mqtt-protocol/58337 "2022-02-14T19:21:59Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Dk\_89](https://avatars.discourse-cdn.com/v4/letter/d/838e76/32.png) [@Dk\_89](https://discourse.nodered.org/u/Dk_89)\
**Post date:** [14 February 2022 19:21 UTC](https://discourse.nodered.org/t/how-do-save-json-values-that-im-receiving-for-mqtt-protocol/58337/1 "2022-02-14T19:21:59Z")

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I am having trouble saving a value within a specific condition, I get several JSON reads, but I only want to store the value that my variable "YUAUB" returns.

Can someone help me?

-- msg.payload : Object

object

variable: "EQT"

value: 0.04

unit: "kVArh"

-- msg.payload : Object

object

variable: "YUAUB"

value: 270.48

unit: "o"

-- msg.payload : Object

object

variable: "YUAUC"

value: 0.44

unit: "o"

-- msg.payload : Object

object

variable: "YUBUC"

value: 89.52

unit: "o"

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**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:** [14 February 2022 19:25 UTC](https://discourse.nodered.org/t/how-do-save-json-values-that-im-receiving-for-mqtt-protocol/58337/2 "2022-02-14T19:25:45Z")

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Have a look at the switch node and the has key comparison.

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<div class="post-metadata">

**Author:** ![Dk\_89](https://avatars.discourse-cdn.com/v4/letter/d/838e76/32.png) [@Dk\_89](https://discourse.nodered.org/u/Dk_89)\
**Post date:** [14 February 2022 19:40 UTC](https://discourse.nodered.org/t/how-do-save-json-values-that-im-receiving-for-mqtt-protocol/58337/3 "2022-02-14T19:40:52Z")

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Could you show me an example of how to write in the switch, please?

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**Author:** ![mickym2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mickym2/32/36128_2.png) [@mickym2](https://discourse.nodered.org/u/mickym2)\
**Post date:** [14 February 2022 19:43 UTC](https://discourse.nodered.org/t/how-do-save-json-values-that-im-receiving-for-mqtt-protocol/58337/4 "2022-02-14T19:43:08Z")

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> [@Dk\_89](#):
>
> YUAUB

Just use a switch node as filter:

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/8/9/89602acdf1f6725796333d1ba398923de75d4ceb.png)

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<div class="post-metadata">

**Author:** ![Dk\_89](https://avatars.discourse-cdn.com/v4/letter/d/838e76/32.png) [@Dk\_89](https://discourse.nodered.org/u/Dk_89)\
**Post date:** [14 February 2022 20:45 UTC](https://discourse.nodered.org/t/how-do-save-json-values-that-im-receiving-for-mqtt-protocol/58337/5 "2022-02-14T20:45:01Z")

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Thank you very much, it helped me a lot.

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [28 February 2022 20:45 UTC](https://discourse.nodered.org/t/how-do-save-json-values-that-im-receiving-for-mqtt-protocol/58337/6 "2022-02-28T20:45:45Z")

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