POST Requests

The body of the request is the payload sent to the server. The special Content-Type header is used to tell the server the format of the body: application/json for JSON data in our case. POST requests are generally not safe methods to call multiple times because that would create duplicate records. For example, you wouldn't want to accidentally send a tweet twice.

await fetch(url, {
  method: "POST",
  mode: "cors",
  headers: {
    "Content-Type": "application/json",
  },
  body: JSON.stringify(data),
});

We need to save newly created users on our Jello server. We will use the getUsers function we created in the last exercise to make sure our creation logic is working.

Let's create the createUser() function. It should:

1. Take URL and the data body as parameters.
2. Call fetch. fetch() should:
   1. Use the POST Method
   2. Use the cors mode
   3. Set the X-API-Key header, with apiKey as its value
   4. Set the Content-Type header with application/json as its value
   5. Set the body field to the stringified JSON representation of the data
3. Return the response's JSON body