# How to compare two values (number input) and(mqtt node) and return true if they're equal
**URL:** https://discourse.nodered.org/t/how-to-compare-two-values-number-input-and-mqtt-node-and-return-true-if-theyre-equal/60945
**Category:** Share Your Nodes
**Tags:** mqtt
**Created:** [7 April 2022 15:05 UTC](https://discourse.nodered.org/t/how-to-compare-two-values-number-input-and-mqtt-node-and-return-true-if-theyre-equal/60945 "2022-04-07T15:05:02Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@emnabk\_12](https://discourse.nodered.org/u/emnabk_12)
#### Post date: [7 April 2022 15:05 UTC](https://discourse.nodered.org/t/how-to-compare-two-values-number-input-and-mqtt-node-and-return-true-if-theyre-equal/60945/1 "2022-04-07T15:05:02Z")
Hey, I want to compare an entering value of a sensor in MQTT node with a number I choose from dashboard and return "True" if they're equal, this didn't seem to work with the Switch node, and even with the function node I couldn't obtain a correct result.
First things first, even the join node didn't work as shown below:
Second, when I try to work without the join node and without mqtt node, with only two number inputs to see how the function works, it gives me false results as well :
Here's the function:
And here's the flow :
````auto
{
"id": "fcd2461e8006fcee",
"type": "debug",
"z": "5827c9d4d1c8df58",
"name": "",
"active": true,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "payload",
"targetType": "msg",
"statusVal": "",
"statusType": "auto",
"x": 670,
"y": 240,
"wires": []
},
{
"id": "f412802581850e86",
"type": "ui_text_input",
"z": "5827c9d4d1c8df58",
"name": "",
"label": "",
"tooltip": "",
"group": "461e2ece4e14a1f0",
"order": 0,
"width": 0,
"height": 0,
"passthru": true,
"mode": "number",
"delay": 300,
"topic": "input",
"sendOnBlur": true,
"topicType": "msg",
"x": 110,
"y": 160,
"wires": [
[
"ec8a10572ea4a3f6"
]
]
},
{
"id": "562da58c24b1338e",
"type": "function",
"z": "5827c9d4d1c8df58",
"name": "",
"func": "context.node = context.node || 0;\ncontext.node1 = context.node1 || 0;\nif(msg.topic == 'input') {\n context.node = msg.payload;\n}\nelse if(msg.topic == 'esp32') {\n context.node1 = msg.payload;\n}\nif ( context.node == context.node1 ) {\n return {topic: 'result_true' , payload: 'True'}\n}\n",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 480,
"y": 160,
"wires": [
[
"fcd2461e8006fcee"
]
]
},
{
"id": "a984d08bac04a505",
"type": "mqtt in",
"z": "5827c9d4d1c8df58",
"name": "",
"topic": "esp32",
"qos": "1",
"datatype": "auto",
"broker": "21cdba4a.be7146",
"nl": false,
"rap": true,
"rh": 0,
"x": 140,
"y": 220,
"wires": [
[
"ec8a10572ea4a3f6"
]
]
},
{
"id": "ec8a10572ea4a3f6",
"type": "join",
"z": "5827c9d4d1c8df58",
"name": "",
"mode": "custom",
"build": "object",
"property": "payload",
"propertyType": "msg",
"key": "topic",
"joiner": "\\n",
"joinerType": "str",
"accumulate": true,
"timeout": "",
"count": "2",
"reduceRight": false,
"reduceExp": "",
"reduceInit": "",
"reduceInitType": "",
"reduceFixup": "",
"x": 310,
"y": 160,
"wires": [
[
"562da58c24b1338e"
]
]
},
{
"id": "461e2ece4e14a1f0",
"type": "ui_group",
"name": "Group 1",
"tab": "ea5e7575d0f9638f",
"order": 1,
"disp": true,
"width": 6
},
{
"id": "21cdba4a.be7146",
"type": "mqtt-broker",
"name": "",
"broker": " 192.168.1.16",
"port": "1883",
"clientid": "",
"usetls": false,
"keepalive": "60",
"cleansession": true,
"birthTopic": "",
"birthQos": "0",
"birthPayload": "",
"closeTopic": "",
"closeQos": "0",
"closePayload": "",
"willTopic": "",
"willQos": "0",
"willPayload": ""
},
{
"id": "ea5e7575d0f9638f",
"type": "ui_tab",
"name": "Tab 6",
"icon": "dashboard",
"order": 6
}
] ```
````
---
### Author:  [@E1cid](https://discourse.nodered.org/u/E1cid)
#### Post date: [7 April 2022 15:15 UTC](https://discourse.nodered.org/t/how-to-compare-two-values-number-input-and-mqtt-node-and-return-true-if-theyre-equal/60945/2 "2022-04-07T15:15:22Z")
Your topic in the number input is not set correct.
No need for context storage, here is an example
```auto
[{"id":"f412802581850e86","type":"ui_text_input","z":"bf9e1e33.030598","name":"","label":"","tooltip":"","group":"461e2ece4e14a1f0","order":0,"width":0,"height":0,"passthru":true,"mode":"number","delay":300,"topic":"input","sendOnBlur":true,"className":"","topicType":"str","x":150,"y":2680,"wires":[["ec8a10572ea4a3f6"]]},{"id":"ec8a10572ea4a3f6","type":"join","z":"bf9e1e33.030598","name":"","mode":"custom","build":"object","property":"payload","propertyType":"msg","key":"topic","joiner":"\\n","joinerType":"str","accumulate":true,"timeout":"","count":"2","reduceRight":false,"reduceExp":"","reduceInit":"","reduceInitType":"","reduceFixup":"","x":350,"y":2680,"wires":[["b525f638.c84768"]]},{"id":"a984d08bac04a505","type":"mqtt in","z":"bf9e1e33.030598","name":"","topic":"esp32","qos":"1","datatype":"auto","broker":"21cdba4a.be7146","x":180,"y":2740,"wires":[["ec8a10572ea4a3f6"]]},{"id":"b525f638.c84768","type":"function","z":"bf9e1e33.030598","name":"","func":"msg.payload = msg.payload.esp32 === msg.payload.input\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","x":520,"y":2680,"wires":[["fcd2461e8006fcee"]]},{"id":"fcd2461e8006fcee","type":"debug","z":"bf9e1e33.030598","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":710,"y":2760,"wires":[]},{"id":"461e2ece4e14a1f0","type":"ui_group","name":"Group 1","tab":"ea5e7575d0f9638f","order":1,"disp":true,"width":6},{"id":"21cdba4a.be7146","type":"mqtt-broker","name":"","broker":" 192.168.1.16","port":"1883","clientid":"","usetls":false,"keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","closeTopic":"","closeQos":"0","closePayload":"","willTopic":"","willQos":"0","willPayload":""},{"id":"ea5e7575d0f9638f","type":"ui_tab","name":"Tab 6","icon":"dashboard","order":6}]
```
Assuming that both inputs are numbers.
---
### Author:  [@emnabk\_12](https://discourse.nodered.org/u/emnabk_12)
#### Post date: [7 April 2022 15:31 UTC](https://discourse.nodered.org/t/how-to-compare-two-values-number-input-and-mqtt-node-and-return-true-if-theyre-equal/60945/3 "2022-04-07T15:31:24Z")
It worked, thanks again.
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [21 April 2022 15:32 UTC](https://discourse.nodered.org/t/how-to-compare-two-values-number-input-and-mqtt-node-and-return-true-if-theyre-equal/60945/4 "2022-04-21T15:32:04Z")
This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.