JSON.parse reports error, even despite proper parsing

[qttester5]

I have a very simple, short JSON piece that validates fine with online validators. When I use JSON.parse in my QML, it parses correctly and I am able to use the values just fine. However, the console logs:

@JSON.parse: Parse error@

Why would Qt Quick (5.2) indicate erroneous parsing when the parsing is in fact happening, and the JSON is valid anyway?

The JSON is simply this:

@{
"files": ["gun","tree","1"],
"repeat": true,
"fps": 25
}@

[qttester5]

Turns out this was because I was using an XMLHttpRequest for the parse data, and should have checked that the XMLHttpRequest was in a finished state before attempting to parse; eventually, it would parse correctly, but intermediate states would cause the parsing to occur on incomplete data.