# How to check function node is working correctly

**URL:** <https://discourse.nodered.org/t/how-to-check-function-node-is-working-correctly/81064>\
**Category:** General\
**Created:** [5 September 2023 21:16 UTC](https://discourse.nodered.org/t/how-to-check-function-node-is-working-correctly/81064 "2023-09-05T21:16:41Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Vinnyvangogo](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/vinnyvangogo/32/31940_2.png) [@Vinnyvangogo](https://discourse.nodered.org/u/Vinnyvangogo)\
**Post date:** [5 September 2023 21:16 UTC](https://discourse.nodered.org/t/how-to-check-function-node-is-working-correctly/81064/1 "2023-09-05T21:16:41Z")

</div>

I am needing help trying to figure out why my function node isn't separating the time, date and TC data correctly. My code is below. Any help would be greatly appreciated.

```auto
[
    {
        "id": "73e4e16.4d9742",
        "type": "inject",
        "z": "f5c39bc78c9f43a9",
        "name": "Inject",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "[{\"Date\":\"2023-09-03\",\"Time\":\"12:37:43\",\"TC1\":7.814468887624555,\"TC2\":9.010489315422356,\"TC3\":2.2051948357794204,\"TC4\":4.634575718286296},{\"Date\":\"2023-09-03\",\"Time\":\"12:40:42\",\"TC1\":1.2247009897949532,\"TC2\":4.502620787639197,\"TC3\":4.220188281544026,\"TC4\":1.9340397044971718},{\"Date\":\"2023-09-03\",\"Time\":\"14:18:02\",\"TC1\":2.5243351824265963,\"TC2\":6.036543260510911,\"TC3\":6.538703425751857,\"TC4\":3.7277151250599543}]",
        "payloadType": "jsonata",
        "x": 350,
        "y": 200,
        "wires": [
            [
                "90ed51dc.dcc71"
            ]
        ]
    },
    {
        "id": "90ed51dc.dcc71",
        "type": "csv",
        "z": "f5c39bc78c9f43a9",
        "name": "",
        "sep": ",",
        "hdrin": true,
        "hdrout": "once",
        "multi": "mult",
        "ret": "\\n",
        "temp": "",
        "skip": "1",
        "strings": true,
        "include_empty_strings": false,
        "include_null_values": false,
        "x": 530,
        "y": 200,
        "wires": [
            [
                "9aace6e7.adc538",
                "b05f7f856d809326"
            ]
        ]
    },
    {
        "id": "9aace6e7.adc538",
        "type": "debug",
        "z": "f5c39bc78c9f43a9",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "true",
        "targetType": "full",
        "statusVal": "",
        "statusType": "auto",
        "x": 670,
        "y": 140,
        "wires": []
    },
    {
        "id": "137d11d9.8c82ee",
        "type": "ui_chart",
        "z": "f5c39bc78c9f43a9",
        "name": "",
        "group": "a649fab2.daf3d8",
        "order": 7,
        "width": 18,
        "height": 6,
        "label": "Temperature Chart",
        "chartType": "line",
        "legend": "false",
        "xformat": "auto",
        "interpolate": "linear",
        "nodata": "",
        "dot": false,
        "ymin": "",
        "ymax": "",
        "removeOlder": 1,
        "removeOlderPoints": "",
        "removeOlderUnit": "3600",
        "cutout": 0,
        "useOneColor": false,
        "useUTC": false,
        "colors": [
            "#1f77b4",
            "#aec7e8",
            "#ff7f0e",
            "#2ca02c",
            "#98df8a",
            "#d62728",
            "#ff9896",
            "#9467bd",
            "#c5b0d5"
        ],
        "outputs": 1,
        "useDifferentColor": false,
        "className": "",
        "x": 1010,
        "y": 340,
        "wires": [
            []
        ]
    },
    {
        "id": "b05f7f856d809326",
        "type": "function",
        "z": "f5c39bc78c9f43a9",
        "name": "DateTime_Data_Split",
        "func": "function toTimestamp(strDate) {\n var datum = Date.parse(strDate);\n return datum / 1000;\n}\n\nvar payload = msg.payload;\n\nvar data_out = [];\nvar a1 = [];\nvar a2 = [];\nvar a3 = [];\nvar a4 = [];\n\nfor (let i = 0; i < payload.length; i++) {\n if (payload[i].Date) {\n console.log(\"Date:\", payload[i].Date);\n console.log(\"Time:\", payload[i].Time);\n var Data = payload[i].Date.split(\"-\");\n var t = Data[2] + \"/\" + Data[1] + \"/\" + Data[0];\n var timestamp = toTimestamp(t + \" \" + payload[i].Time);\n\n var temp1 = { \"x\": timestamp, \"y\": parseFloat(payload[i].TC1) };\n var temp2 = { \"x\": timestamp, \"y\": parseFloat(payload[i].TC2) };\n var temp3 = { \"x\": timestamp, \"y\": parseFloat(payload[i].TC3) };\n var temp4 = { \"x\": timestamp, \"y\": parseFloat(payload[i].TC4) };\n\n a1.push(temp1);\n a2.push(temp2);\n a3.push(temp3);\n a4.push(temp4);\n\n console.log(\"temp1:\", temp1);\n console.log(\"temp2:\", temp2);\n console.log(\"temp3:\", temp3);\n console.log(\"temp4:\", temp4);\n }\n}\n\ndata_out = [a1, a2, a3, a4];\n\nmsg.payload = [{\n \"series\": [\"TC1\", \"TC2\", \"TC3\", \"TC4\"],\n \"data\": data_out,\n \"labels\": [\"TC1\", \"TC2\", \"TC3\", \"TC4\"]\n}];\n\nreturn msg;\n",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 740,
        "y": 340,
        "wires": [
            [
                "137d11d9.8c82ee",
                "b27011309a3a3080"
            ]
        ]
    },
    {
        "id": "b27011309a3a3080",
        "type": "debug",
        "z": "f5c39bc78c9f43a9",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "false",
        "x": 970,
        "y": 200,
        "wires": []
    },
    {
        "id": "a649fab2.daf3d8",
        "type": "ui_group",
        "name": "File Browser",
        "tab": "75e4e587.f4c0ac",
        "order": 1,
        "disp": true,
        "width": "18",
        "collapse": false
    },
    {
        "id": "75e4e587.f4c0ac",
        "type": "ui_tab",
        "name": "Files",
        "icon": "dashboard",
        "disabled": false,
        "hidden": false
    }
]

```

---

<div class="post-metadata">

**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [5 September 2023 21:28 UTC](https://discourse.nodered.org/t/how-to-check-function-node-is-working-correctly/81064/2 "2023-09-05T21:28:40Z")

</div>

It would be better if you can show us the function code, the msg going in and the value you expect Vs the value you are getting.

---

<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 September 2023 22:25 UTC](https://discourse.nodered.org/t/how-to-check-function-node-is-working-correctly/81064/3 "2023-09-05T22:25:50Z")

</div>

Your function works for me when the csv node is removed, as it converts your injected array of objects into a csv text string.  
Also your timestamp function divides by 1000 which converts the timestamp to a unix timestamp in seconds, when the chart wants a unix timestamp in milliseconds or a ISO formated timestamp.

 ![chrome_screenshot_1693952647051](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/6/1/61a305e75611a5363c13c6a86585659881d26a09.png)

[edit]  
If the input is a csv then this example of how to simulate csv input may help

```auto
[{"id":"d7cd17c8792d2a86","type":"inject","z":"b9860b4b9de8c8da","name":"csv input","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":440,"y":460,"wires":[["52accde3cd474244"]]},{"id":"52accde3cd474244","type":"template","z":"b9860b4b9de8c8da","name":"","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"Date,Time,TC1,TC2,TC3,TC4\n2023-09-03,12:37:43,7.814468887624555,9.010489315422356,2.2051948357794204,4.634575718286296\n2023-09-03,12:40:42,1.2247009897949532,4.502620787639197,4.220188281544026,1.9340397044971718\n2023-09-03,14:18:02,2.5243351824265963,6.036543260510911,6.538703425751857,3.7277151250599543\n","output":"str","x":540,"y":420,"wires":[["ba455151a9c1b04f"]]},{"id":"ba455151a9c1b04f","type":"csv","z":"b9860b4b9de8c8da","name":"","sep":",","hdrin":true,"hdrout":"all","multi":"mult","ret":"\\n","temp":"","skip":"0","strings":true,"include_empty_strings":"","include_null_values":"","x":650,"y":460,"wires":[["9aace6e7.adc538","b05f7f856d809326"]]},{"id":"9aace6e7.adc538","type":"debug","z":"b9860b4b9de8c8da","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":770,"y":360,"wires":[]},{"id":"b05f7f856d809326","type":"function","z":"b9860b4b9de8c8da","name":"DateTime_Data_Split","func":"function toTimestamp(strDate) {\n var datum = Date.parse(strDate);\n return datum;\n}\n\nvar payload = msg.payload;\n\nvar data_out = [];\nvar a1 = [];\nvar a2 = [];\nvar a3 = [];\nvar a4 = [];\n\nfor (let i = 0; i < payload.length; i++) {\n if (payload[i].Date) {\n console.log(\"Date:\", payload[i].Date);\n console.log(\"Time:\", payload[i].Time);\n var Data = payload[i].Date.split(\"-\");\n var t = Data[2] + \"/\" + Data[1] + \"/\" + Data[0];\n var timestamp = toTimestamp(t + \" \" + payload[i].Time);\n\n var temp1 = { \"x\": timestamp, \"y\": parseFloat(payload[i].TC1) };\n var temp2 = { \"x\": timestamp, \"y\": parseFloat(payload[i].TC2) };\n var temp3 = { \"x\": timestamp, \"y\": parseFloat(payload[i].TC3) };\n var temp4 = { \"x\": timestamp, \"y\": parseFloat(payload[i].TC4) };\n\n a1.push(temp1);\n a2.push(temp2);\n a3.push(temp3);\n a4.push(temp4);\n\n console.log(\"temp1:\", temp1);\n console.log(\"temp2:\", temp2);\n console.log(\"temp3:\", temp3);\n console.log(\"temp4:\", temp4);\n }\n}\n\ndata_out = [a1, a2, a3, a4];\n\nmsg.payload = [{\n \"series\": [\"TC1\", \"TC2\", \"TC3\", \"TC4\"],\n \"data\": data_out,\n \"labels\": [\"TC1\", \"TC2\", \"TC3\", \"TC4\"]\n}];\n\nreturn msg;\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":700,"y":540,"wires":[["b27011309a3a3080"]]},{"id":"73e4e16.4d9742","type":"inject","z":"b9860b4b9de8c8da","name":"object input","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"[{\"Date\":\"2023-09-03\",\"Time\":\"12:37:43\",\"TC1\":7.814468887624555,\"TC2\":9.010489315422356,\"TC3\":2.2051948357794204,\"TC4\":4.634575718286296},{\"Date\":\"2023-09-03\",\"Time\":\"12:40:42\",\"TC1\":1.2247009897949532,\"TC2\":4.502620787639197,\"TC3\":4.220188281544026,\"TC4\":1.9340397044971718},{\"Date\":\"2023-09-03\",\"Time\":\"14:18:02\",\"TC1\":2.5243351824265963,\"TC2\":6.036543260510911,\"TC3\":6.538703425751857,\"TC4\":3.7277151250599543}]","payloadType":"json","x":410,"y":520,"wires":[["b05f7f856d809326"]]},{"id":"b27011309a3a3080","type":"debug","z":"b9860b4b9de8c8da","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":1010,"y":420,"wires":[]}]

```

As to how to check function is working correctly, you can use node.warn() as well as the console.log() you are already using.

---

<div class="post-metadata">

**Author:** ![Vinnyvangogo](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/vinnyvangogo/32/31940_2.png) [@Vinnyvangogo](https://discourse.nodered.org/u/Vinnyvangogo)\
**Post date:** [6 September 2023 12:59 UTC](https://discourse.nodered.org/t/how-to-check-function-node-is-working-correctly/81064/4 "2023-09-06T12:59:45Z")

</div>

OK, I wasn't sure why I needed the CSV node. Now I know I don't need it. Thank You!

---

<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:** [5 November 2023 13:00 UTC](https://discourse.nodered.org/t/how-to-check-function-node-is-working-correctly/81064/5 "2023-11-05T13:00:13Z")

</div>

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