Node.js 如何从MongoDB返回对象

我需要使用HTTP GET在Node Js中找到API的所有文档，但响应不是对象

我的代码：

app.get ('/altas', (req, res) => {

/*Trae la info de la base de datos*/
    MongoClient.connect (url, { 
        useNewUrlParser: true, useUnifiedTopology: true }, (err, db) => {
            if (err) throw err;
            dbo = db.db ("uade-clase-36");
        dbo.collection ('api_autos_emilio').findOne({}, (err, result) => {
        if (err) throw err;
        db.close();
    });
}); 

}))

错误/响应：

_eventsCount: 2,
      _maxListeners: undefined,
      _connections: 1,
      _handle: [TCP],
      _usingWorkers: false,
      _workers: [],
      _unref: false,
      allowHalfOpen: true,
      pauseOnConnect: false,
      httpAllowHalfOpen: false,
      timeout: 120000,
      keepAliveTimeout: 5000,
      maxHeadersCount: null,
      headersTimeout: 60000,
      _connectionKey: '6::::3000',
      [Symbol(IncomingMessage)]: [Function: IncomingMessage], ... THIS NOT THE END.