Injecting one document

Before we start, we should look at the code structure that we need for every route that we will be creating:

// server/routes.js
router.get('/user', async (ctx, next) => {
  let result
  try {
    const connection = await mongo.connect()
    const collectionUsers = connection.collection('users')
    result = await collectionUsers...
    mongo.close()
  } catch (err) {
    ctx.throw(500, err)
  }
  ctx.type = 'json'
  ctx.body = result
})

Let's discuss the structure:

• Catching and throwing errors:
  When we use the async/await statement instead of the Promise object for an asynchronous operation, we must always wrap them in try/catch blocks to handle errors:

try {
  // async/await code
} catch (err) {
  // handle error
}

• Connecting to MongoDB databases and collections:
  Before performing any CRUD operation, we must establish the connection and connect to the specific collection that we want to manipulate. In our case, the...