node.js export value from get to post

i working on a node.js code to post value using ajax url and json encode but I get this error when I try to export value from app.post to app.get to print it on a web page ReferenceError: output is not defined from this line

res.end(JSON.stringify(output));

so how i define this line on app.get ?

app.get('/insertmove', function (req, res, next) {

        res.end(JSON.stringify(output));



});

app.post('/insertmove', function (req, res, next) {
var lMove="rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";


if(req.body.MoveString !== null){
     Move.player.setMoveUserId = req.user.id ;
     Move.player.setMoveString = req.body.MoveString;
     a.InsertMove(req.user.GameId);
     lMove=a.getLastMove(req.user.GameId);


    }
     var output = {"msg":lMove, "loggedin":true};



});

via dark night