node-json2json is a node module that implements the json restructuring engine json2json for node.js
npm install node-json2json
var json2json = require('node-json2json');
var data = {'c:areaChart':{'needthis':{'propArea':'value'},'dontneedthis':{}},
'c:pieChart':{'needthis':{'propPie':'value'},'dontneedthis':{}}};
var transform = {'$[var=c:(.+)Chart]':'','chart':'$(var)','stuff':'${c:$(var)Chart.needthis}'};
console.log( json2json.transform(data,transform) );json2json is still in a pre-beta mode (hence the 0.0.1 version) so any changes/improvements are greatly appreciated.