sails How to show the message taken from res.badRequest in client -

recently have encountered 1 issue want show message taken res.badrequest().

when error happens, code like:

var errmsg = 'begin date should before end date, please check'; sails.log.error(errmsg);    return res.badrequest(errmsg); 

but when tried error message in client, failed, , here code in ejs:

<% if ( res.data ) { %><%=res.data%><% } %> 

where did make mistake? in advance.