Hi Roberto, Never mind latin1. What about BINARY, one of the datatypes explicitly supported by dynamic columns? If you put a BINARY string into a dynamic column, what should COLUMN_JSON do? All other JSON encoders I know error on data that cannot be encoded as JSON. But Maria instead returns non-JSON. Tom From: Roberto Spadim <roberto@spadim.com.br> Date: Saturday, January 31, 2015 at 3:48 PM To: Peter Laursen <peter_laursen@webyog.com> Cc: Tom Worster <fsb@thefsb.org>, maria-discuss email list <maria-discuss@lists.launchpad.net> Subject: Re: [Maria-discuss] JSON and binary strings one "problem" about JSON, it only accept Unicode, be carefull when using latin1 + utf8 + json http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf "2 Conformance Conforming JSON text is a sequence of Unicode code points that strictly conforms to the JSON grammar"