All because IE6 wasn't supporting trailing commas at the time when JSON was written. Shortly after that we discovered that it was a bad idea to eval() JSON so t

All because IE6 wasn't supporting trailing commas at the time when JSON was written. Shortly after that we discovered that it was a bad idea to eval() JSON so the whole reason for browser compatibility became moot. But who knows, maybe that is what was needed at the time to make JSON popular.