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This is why The Creator gave the world arrays.

var msgs = [];
for (var i = 0; i < 200; ++i)
 msgs.push(parseFloat(json[i]['valor' + i]));

Note that your JSON data should also keep those "valor" properties as arrays, though in JavaScript you can deal with a bizarre naming scheme like that as in the example above.

edit — oops, typos fixed :-)