How define headers in the incoming data

I’m trying to use something like this here
docs.dhtmlx.com/grid__json_configuration.html

I usin Web API 2 why oauth 2.0 for security, and the service response some one like:

{“head”:
[{“id”:“AlgoId”,“width”:50,“type”:“ed”,“align”:“left”,“sort”:“str”,“value”:“AlgoId”}
,{“id”:“Dato1”,“width”:50,“type”:“ed”,“align”:“left”,“sort”:“str”,“value”:“Dato1”
,{“id”:“Dato2”,“width”:50,“type”:“ed”,“align”:“left”,“sort”:“str”,“value”:“Dato2”}
,{“id”:“Total”,“width”:50,“type”:“price”,“align”:“left”,“sort”:“str”,“value”:“Total”}]
,“data”:
[{“AlgoId”:403840,“Dato1”:“0303002”,“Dato2”:“0303074”,“Total”:1842.08},
{“AlgoId”:403839,“Dato1”:“0303002”,“Dato2”:“0303074”,“Total”:1494.08},
{“AlgoId”:400309,“Dato1”:“0303002”,“Dato2”:“0303074”,“Total”:183.28},
{“AlgoId”:400268,“Dato1”:“0303002”,“Dato2”:“0303074”,“Total”:116},
{“AlgoId”:400267,“Dato1”:“0303002”,“Dato2”:“0303074”,“Total”:133.4},
{“AlgoId”:400229,“Dato1”:“0303002”,“Dato2”:“0303074”,“Total”:142.68}]
}"

and I using only

mygrid = new dhtmlXGridObject(‘gridbox’);
mygrid.setImagePath("…/codebase/imgs/");
mygrid.setSkin(“dhx_skyblue”);
mygrid.load(data,“json”)

where data is the resul of service converted with
var result = JSON.stringify(data);
I already trying to

mygrid.parse(result ,“json”)

but nothing

S.O.S

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