var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://127.0.0.1:27017/";

MongoClient.connect(url, { useNewUrlParser: true },function(err, db) {
  if (err) throw err;
  var dbo = db.db("latihandb");
  var myquery = { nama: /^J/ };
  var newvalues = {$set: {umur: 26} };
  dbo.collection("author").updateMany(myquery, newvalues, function(err, res) {
    if (err) throw err;
    console.log(res.result.nModified + " document(s) updated");
    db.close();
  });
});