fetch a json document and display it in svelte in javascript

To fetch a JSON (JavaScript Object Notation) document and display it in a Svelte component, you can use the Fetch API, which is a modern replacement for XMLHttpRequest (XHR).

Assuming that the JSON data is served at a URL endpoint, you can make an asynchronous GET request to that endpoint using fetch(), parse the response using the json() method, and store the resulting object in a Svelte component's reactive variable to render it in a template.

Here's an example Svelte component that fetches and displays a list of users from a JSON API:

<script>
  let users = [];

  async function getUsers() {
    const response = await fetch('https://jsonplaceholder.typicode.com/users');
    if (response.ok) {
      users = await response.json();
    }
  }

  getUsers();
</script>

<h1>Users:</h1>
<ol>
  {#each users as user}
    <li>{user.name}</li>
  {/each}
</ol>
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In this example, the users variable is initially set to an empty array []. After the getUsers() function is called in the script tag, the fetch() method sends a GET request to the JSON API endpoint.

The json() method extracts the JSON data from the response object and returns a promise that resolves to a JavaScript object, which is then assigned to the users variable and rendered using the each block in the template tag.