proto2json.js

var ProtoBuf = require("protobufjs"),
    fs = require("fs"),
    util = require("util"),
    path = require("path"),
    jsonfile = require('jsonfile');

var output_folder = './json_output'


// var parser = new ProtoBuf.DotProto.Parser(fs.readFileSync(process.argv[3]));
// var ast = parser.parse();
// console.log(util.inspect(ast, false, null, true));

var builder = ProtoBuf.newBuilder({convertFieldsToCamelCase: true});
ProtoBuf.loadProtoFile(path.resolve(process.argv[3]), builder);
var message = builder.build("edu.psu.cse.siis.ic3.Application");

var buffer = fs.readFileSync(process.argv[2]);
var mymsg = message.decode(buffer);

if (!fs.existsSync(output_folder)){
    fs.mkdirSync(output_folder);
}
var output = output_folder + '/' +
                path.basename(process.argv[2], '.dat') + '.json'

jsonfile.writeFile(output, mymsg,  {spaces: 4}, function (err) {
    if (err) {
        console.error(err);
    }
})

//console.log(util.inspect(mymsg, showHidden=false, depth=null, colorize=true));