Probaly very easy but I have put several housr trying to get his working. I am using Weather-Display to publish weather data to my Mosquitto. I got this now when doing debug. WeatherDisplay/temp2 : msg.payload : string[6] "{12.8}" I want the payload to be just 12.8 so I can put that value in my…

You can use the Change node to remove { and } The quotes indicate it's a string rather than a number (as you can see it only has 6 characters) Set the change node to "change" and then search and replace...

Thanks for a fast answer ! I am new to Node red so I need a little more help Adding Funtion to flow is no problem but how to write the function is worse [image]

The function node uses JavaScript to work around the problem programmatically. For this you need basic knowledge of javascript, and a small amount of knowledge on how Node-RED works. Check the following links from the node-red docs: working with messages and using the function node . Beyond that, ta…

Thanks, will read those pages and see if I understand more. But isnt there anything in Node-Red that can do that witout any programming skills ?

[image] Quart666: But isnt there anything in Node-Red that can do that witout any programming skills ? You can use JSONata syntax in a change node to do the same, setting a substring of that outer string that way. But that requires learning and programming in the JSONata syntax. Here's an exa…

Or you could use node-red-contrib-string I think, but it is horrendous overkill. If you want to get the best out of node-red you will need some basic javascript.

So there's three options on how to do this.... I just put together a sample flow to show they all give exactly the same result. [{"id":"30adbf39.74344","type":"inject","z":"6d1914f5.165c5c","name":"","topic":"","payload":"{12.8}","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay"…

Maybe not the best way to do but with my minimal programming skills it solved the problem [image] [image]

I think I understand the solutions presented here, but I'm wondering why my solution in a function block does not work: var payLoad = msg.payload; payLoad.replace("}}", ""); payLoad.replace('{', ''); var timeLeft = payLoad.split(':'); msg.payload = timeLeft[3]; return msg;

What does your payload contain & where does it come from (MQTT? HTTP request? Etc?) Can you screenshot the debug message? (You can paste a screen snip directly into a reply)

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Remove "{ }" from payload

General

afelix 4 September 2019 09:20 2

Have you thought about using a function node to set msg.payload to a substring starting at position 1 (it’s 0-indexed), and ending at the length of the payload - 1?

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Remove "{ }" from payload

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