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How to reference embedded attribute using Json.decode


Question

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
              self.httpClient:request(urlinfo, 
                { 
                  options={method = "GET"
                  },
                  success = function (response)
                    if (response.status >= 200 and response.status < 300then
                      jS = json.decode(response.data)               
                      self:debug(response.data)

 

Returns the following response

 {"response_code":0,"band":"fm","auto_scan":false,"fm":{"preset":4,"freq":106500,"tuned":true,"audio_mode":"mono"}}

 

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"

    self:debug(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)
    print(xlat["fm"]["freq"])
     
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