如何在Node-RED中拆分JSON字符串后提取值

Question

I am injecting a String into my flow, then making it into a JSON String with the JSON node and splitting it with the split node. I get 5 messages out of this split node because there are 5 values with 5 properties. What I need is to extract only one of the values, to then use it in a function node. How can I do this?

This is a picture of one of the 5 outputs. What I want is to ONLY use the value (137) in a function node that should come after the split node. Thanks in advance.

Answer 1

You do nothing.

You just access the value as msg.payload in the function node.

Answer 2

msg.payload.energy_wh 

这将访问函数节点中的值。