js2json.js

const vm = require('vm');
var data = [];
process.stdin.setEncoding('utf8');
process.stdin.on('readable', () => {
    const chunk = process.stdin.read();
    if (chunk !== null) {
        data.push(chunk);
    }
});
process.stdin.on('end', () => {
    const jsStr = 'var obj = ' + data.join('');
    const sandbox = {};
    vm.createContext(sandbox);
    vm.runInContext(jsStr,sandbox);
    process.stdout.write(JSON.stringify(sandbox.obj));
});