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How to reference embedded attribute using Json.decode



Newbie scripting question. Thanks to all the posts here I have learnt a lot in the last few weeks ... so thank you for all your knowledge and insights and generosity for sharing.


I am adapting Yamaha MusicCast QA.


I have worked out how to query the Yamaha depending on what it is playing eg Tuner or Spotify etc.


My query as per below code 

  local queryinfo = "/YamahaExtendedControl/v1/tuner/getPlayInfo"
              urlinfo = url .. "" .. queryinfo
                  options={method = "GET"
                  success = function (response)
                    if (response.status >= 200 and response.status < 300then
                      jS = json.decode(response.data)               


Returns the following response



I have learnt to reference the band I can simply do something like

 band = (js.band)


The question is .. how do I extract the "freq" value?


if I do freq = (js.freq) I get "nil"


How do you parse the values embedded within a secondary {} ?

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  • Inquirer
  • Yes that is the one I am adapting .. Sorry I didn't quite understand


    Did you mean..


    freq = response.data["freq"



    But still get nil

    I had tried just 
    freq = data["freq"


    but got


    main.lua:215: attempt to index a nil value (global 'data')

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    OMG. OK


    Please login or register to see this attachment.



    local raw =  '{"response_code":0,"band":"fm","auto_scan":false,"fm":{"preset":4,"freq":106500,"tuned":true,"audio_mode":"mono"}}';
    local xlat = json.decode(raw)
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