Payload to base64

General
1

I'm trying to encode a simple string into base64 and it doesn't work. Where is my mistake?

This is my simple flow. It is an injection of payload string and I use msg.payload.toString('base64') function that return the payload unchanged. :frowning:

[
    {
        "id": "2b928680670e4e84",
        "type": "tab",
        "label": "Flow 1",
        "disabled": false,
        "info": "",
        "env": []
    },
    {
        "id": "edf6c1fde29fbbc9",
        "type": "inject",
        "z": "2b928680670e4e84",
        "name": "Off",
        "props": [
            {
                "p": "payload"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "0",
        "payloadType": "str",
        "x": 270,
        "y": 220,
        "wires": [
            [
                "c813605ba3679017"
            ]
        ]
    },
    {
        "id": "c813605ba3679017",
        "type": "function",
        "z": "2b928680670e4e84",
        "name": "",
        "func": "\nmsg.payload.toString(\"base64\");\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 480,
        "y": 220,
        "wires": [
            [
                "d042f113ad2a7a3a"
            ]
        ]
    },
    {
        "id": "d042f113ad2a7a3a",
        "type": "debug",
        "z": "2b928680670e4e84",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "false",
        "statusVal": "",
        "statusType": "auto",
        "x": 670,
        "y": 220,
        "wires": []
    }
]

This the result:

immagine
immagine1299×293 15.4 KB

Thanks for the help.

2

A low code solution is to use the base64 node. Otherwise...

const buf = Buffer.from(msg.payload)
msg.payload = buf.toString("base64");
return msg;
3

There is also a $base64enode() function that can be used in the change node, using JSONata.
e.g.

[{"id":"edf6c1fde29fbbc9","type":"inject","z":"2b928680670e4e84","name":"Off","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"0","payloadType":"str","x":270,"y":220,"wires":[["1329b982.bc40ee"]]},{"id":"1329b982.bc40ee","type":"change","z":"2b928680670e4e84","name":"","rules":[{"t":"set","p":"payload","pt":"msg","to":"$base64encode($$.payload)","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":440,"y":220,"wires":[["d042f113ad2a7a3a"]]},{"id":"d042f113ad2a7a3a","type":"debug","z":"2b928680670e4e84","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":670,"y":220,"wires":[]}]
1 Like
4

Thanks. My node.js knowledge is not very good. Just to understand, the function toString('base64') work only applied to buffer object, that right?

5

Yes.

The easy way to understand this is to look at the docs.

For example, the buffer.toString function accepts an encoding parameter

But string.toString does not.

6

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