router.route('/:productId').get(async (req, res) => {
  try {
    const product = await Product.findById(id)
    if (!product) {
      return res
        .status(400)
        .json({ success: false, message: 'product not found' })
    }
    res.json({ product })
  } catch {
    res
      .status(400)
      .json({ success: false, message: 'could not retrieve product ' })
  }
})