a.rb

process.stdin.pipe(require('split')()).on('data', processLine)

var holder = {}

process.stdin.on('end', function() {
    console.log(holder);
});

function processLine (line) {
    try {
        var tO = JSON.parse(line);
        var parent = tO.key.substring(0, tO.key.length-2)
        if (holder[parent]) {
            for (var a in tO.attributes) {
                holder[parent][a].push(tO.attributes[a]);
            }
        } else {
            for (var a in tO.attributes) {
                holder[parent] = {}
                holder[parent][a] = [tO.attributes[a]];
            }
        }
    } catch(err) {
        console.log(err)
    }
}