How do I get a URL parameter in Express?

Checking the expected result, I see that you have two problems. The first is that you want to get the parameters according to the string displayed in the parameters query . For this you need to use the query attribute of your req :

const { price, description } = req.query;

The second point is that you want to find a text containing what is passed in description and for this you can use the $regex :

{ description: { $regex: description, $options: 'i' } };

Now putting this information together and allowing the parameters to be optional we have the following result in its controller :

const getMenus = async (req, res) => {
  try {
    const { price, description } = req.query;
    let where = {};

    if (price) {
      where.price = price;
    }

    if (description) {
      where.description = { $regex: description, $options: 'i' };
    }

    const menu = await Menus.findOne(where).exec();

    // Caso não encontre nenhum registro para a busca especificada
    if (!menu){
      const message = 'Não existe nenhum Reviews nesse registro';
      console.error(message);
      res.status(404).send({ message });
      return;
    }

    // Se tudo correr bem
    res.status(200).send(menu);
  } catch(e) {
    const message = 'Erro na solicitação.';
    console.error(e);
    res.status(500).send({ message });
  }
}

You can check the Mongoose documentation for a variety of different conditions here .

To catch a query string parameter, you need the object req.query :

const app = require('express')();

// [...]

app.get('/menus', (req, res) => {
  // Assumindo que a requisição será feita para:
  // GET /menus?price=valor
  const { price } = req.params;
  return res.send('Você requisitou o menu com preço de ${price}.');
});

// [...]

To learn more, I suggest you take a look at the documentation:

• req ;
• req.params .