Build JSON out of variables

I try to build Dynamic Notifications, my payload have to look like this:

   "extras": {
       "client::display": {
      "contentType": "text/markdown"
       "client::notification": {
           "click": {"url": "$URL" }
   "message": "$MESSAGE.",
   "priority": 3,
   "title": "$TITLE"

as inputs i have for example a "msg.url" wich contains the url of a service

  • $URL in my payload should be replaced by msg.url
  • the $MESSAGE should be replaced with "msg.text" wich contains the text
  • $TITLE should be replaced with the content from msg.title

Played arround with the JSON node, function node and googled, after an hour of try and error i hope that someone can bring me in the right direction :slight_smile:

You can do this with the template node.

[{"id":"502b7419641df689","type":"inject","z":"bf9e1e33.030598","name":"","props":[{"p":"URL","v":"","vt":"str"},{"p":"TITLE","v":"The Title","vt":"str"},{"p":"MESSAGE","v":"Test Message","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":130,"y":140,"wires":[["8a4a3841.d3d04"]]},{"id":"8a4a3841.d3d04","type":"template","z":"bf9e1e33.030598","name":"","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"{\n   \"extras\": {\n       \"client::display\": {\n      \"contentType\": \"text/markdown\"\n    },\n       \"client::notification\": {\n           \"click\": {\"url\": \"{{URL}}\" }\n        }\n  },\n   \"message\": \"{{MESSAGE}}.\",\n   \"priority\": 3,\n   \"title\": \"{{TITLE}}\"\n}","output":"json","x":350,"y":140,"wires":[["8ad333f6.78443"]]},{"id":"8ad333f6.78443","type":"debug","z":"bf9e1e33.030598","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":560,"y":140,"wires":[]}]

You may want to use triple {{{ if you don't want the text urlencoded.

Or you could use a change node with JSONata, or a function node with Javascript

1 Like

u are my hero today :slightly_smiling_face: thx :slightly_smiling_face:

You don't even need to use the template node. A JavaScript object can be turned into JSON using the JSON node :grinning:

That will be more robust than trying to do it yourself.

Of course, you can build a javascript object in many ways including change nodes (with or without JSONata) and function nodes.

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