如何从 Node-red 中的嵌套 JSON 有效负载中提取“temp”的值？

Question

{"rssi":-46,"message":"{\"temp\":55,\"hum\":88,\"moist\":50}"}

In the above payload, I can extract the value of rssi using the following code in Node-red.

p = JSON.parse(msg.payload);
node.log(typeof p);
msg.payload = p.rssi;
return msg;

But how do I extract the value of temp from this.

Answer 1

There is a colon missing in the source json. It should be

{"rssi":-46,"snr":{"temp":55,"hum":88,"moist":55}"}

Like @Andreas mentioned, after first line its all about accessing the object "p".

You should be able to access the temp using

msg.payload=p.snr.temp;