Question about msg.payload to number value for graphs

General
1

so here is my question:

I want to pull only the counter data out of the payload, convert to number value and feed to graph node. Im a newbie. What nodes or code should i use? best method?

Payload data below:

{"payload":"oCsiAiYANwUBtziKmvw=","message":{"app_id":"bigmikesnode","dev_id":"mikeh001","port":0,"confirmed":true,"payload_raw":"ug=="},"gateway_id":"eui-b827ebfffe094965","config":{"modulation":"LORA","data_rate":"SF7BW500","airtime":11584000,"counter":1335,"frequency":923900000,"power":20}}

2

Start by reading the node red docs page Working with Messages. That should get you going.

3

... and once you have done that you should be able to use a change node to move the counter property to the payload to feed into the chart.