2) Node.js is great for making web APIs because it is asynchronous by nature and thus allows for high input/output. By this we mean that it allows many users to make very light requests at the same time.

This is an Express application using `bodyParser` middleware to convert the request body to JSON.

There are currently four actions:

- `list` (`GET /todos`): Lists all todos

- `create` (`POST /todos`): Creates a new todo

- `update` (`PUT /todos/:id`): Updates the description of a todo

- `remove` (`DELETE /todos/:id`): Deletes a todo

- `actions`: Contains the actions as listed above, each as a express handler (function accepting request and response)

- `data`: Contains the data file `todos.json`

- `models`: Contains the Todo model class

- `util`: Utility functions

- `index.js` The application file

When calling the `create` or `update` actions, the request body should look like this:

{

"todo": {

"description": "(todo description)"

}

}

Note that for these actions, the client should add the following header:

- `Content-Type`: `application/json`

In Postman, make sure to add this header, and set the Body type to "Raw".

For IDs, this application uses "UUIDs" (Universally Unique IDs). They can be generated using the `uuid` package, and are guaranteed never to be the same.