Accepted answer

You can loop over the data and then loop over the data.d again to get all of the required data. For each of the data, you push it into another array that you will later use.

const data = [{a:2,b:3,c:4,d:[{e:5,f:4,g:6,},{h:5,i:4,j:6,}]},{a:11,b:31,c:42,d:[{e:54,f:46,g:62,},{h:55,i:42,j:64,}]}]
let result = [];
data.forEach(d => d.d.forEach(dd => result.push(dd)));

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