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jsonstringmessagenode-red

How can i seperate/split part of string messege in node red

I received this message:

 "data: "{"cmd":"gw","seqno":515816,"EUI":"000DB53113683569","ts":1510584501221,"fcnt":1,"port":2,"freq":868100000,"toa":1482,"dr":"SF12 BW125 4/5","ack":false,"gws":[{"rssi":-71,"snr":9.5,"ts":1510584501221,"time":"2017-11-13T14:48:21.218869Z","gweui":"B827EBFFFF6A14DD","lat":50.0751806,"lon":14.4022641}],"bat":255,"data":"0002560000000000000000"}""

I need to put away the "data: " and on the end the "

I need just the JSON message if I use JSON node it just writes me an error because of the "data: "

Solution

  • You can use a function node to chop the string up. Something like this:

    msg.payload = msg.payload.substring(7,msg.payload.length - 1);
return msg;

    And then wire this to a JSON node.