How can I get the distance value and how to assign it to another variable. I get that data from bluemix (Watson IoT Platform) to node-red
{distance:"45.9"};
I tried like
var data=msg.distance;
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amadain
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Duplicate of http://stackoverflow.com/questions/5726729/how-to-parse-json-using-node-js – RayfenWindspear Feb 07 '17 at 17:10
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`{distance:"45.9"}` is not JSON. It's a JavaScript object literal. – Jordan Running Feb 07 '17 at 17:15
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from that how can i get value – ARIKATLA KRISHNA REDDY Feb 07 '17 at 17:32
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I think we are going to need some more context. Is msg the name of your object? Are you trying to reference it outside of it's scope? – tjfo Feb 07 '17 at 17:44
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my exact use case is I need to get data from ibmiot node and by using that data I need to turn on led by using condition. – ARIKATLA KRISHNA REDDY Feb 07 '17 at 18:07
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I got data from ibmiot as {distance:"34"} . so now I need to check that value is less than some particular value then I need to turn on led which is on raspberry pi – ARIKATLA KRISHNA REDDY Feb 07 '17 at 18:08
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I think this is a common issue for NodeRed developers who lack dev experience and would be useful to others IF it is improved. – amadain Feb 08 '17 at 10:21
2 Answers
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Use Json.parse to convert the string to an array.Now you can access the elements of the array.
aaditya
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If you include the JSON node it will convert your JS Object to JSON. But maybe you have messed with the quotes and actually have json; by default you would.
I would add a Debug node to your IoT-In node. Check what exactly you receive. And then it is usually easy to parse like (it depends on what you send):
var distance = msg.payload.d.distance
var distance = msg.payload.distance
You might want to edit your Question to include exactly what you receive in the Debug node and need to parse.
Also be aware that your value for distance is a string, you'll probably want to convert it to a number at somepoint. If it is in your control, it would be better practice to send it as a number to start with.
amadain
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