See https://github.com/oracle/node-oracledb/issues/65#issuecomment-128715957

query-all.js

"use strict";

exports.queryAll = function(conn, sql, args, cb) {
    var allRows = [];
    conn.execute(sql, args, {
        resultSet: true
    }, function(err, result) {
        if (err) return cb(err);

        function fetch() {
            var max = 50;
            result.resultSet.getRows(max, function(err, rows) {
                if (err) return cb(err);
                allRows.push(rows);
                if (rows.length === max) {
                    fetch();
                } else {
                    result.resultSet.close(function(err) {
                        if (err) return cb(err);
                        cb(null, Array.prototype.concat.apply([], allRows));
                    });
                }
            });
        }
        fetch();
    });
}

Thanks for the queryAll example.