Performing AJAX requests in SvelteKit using the fetch function

Within my SvelteKit application, I am utilizing AJAX calls to interact with my API endpoints. An example of this can be seen in the following code snippet:

+page.svelte

<script>
 async function get_card() {
        const url = '/api/card/?category=' + $page.params.slug;
        const response = await fetch(url, {
                method: 'GET',
            })
        const card = await response.json();
        return card;
    }
</script>

Upon examining the browser's JavaScript console, a warning is displayed:

Loading /api/card/?category=Neurology using `window.fetch`. 
For optimal results, it is recommended to use the `fetch` provided within your `load` 
function: https://kit.svelte.dev/docs/load#making-fetch-requests

Despite this, it seems that the `fetch` function mentioned is only accessible on the server side, making it challenging to utilize in scripts that may run on the client side (such as +page.svelte). One attempt was made to pass the function as part of the data object from the load function:

+layout.server.js

export const load = async ({ fetch, locals }) => {
    return {
      email: locals.user.email,
      group: locals.user.group,
      fetch: fetch
    }
}

Unfortunately, this approach proved unsuccessful as the function is not serializable.

Is there a better way to approach this issue, or should I simply disregard the warning message?

Answer №1

fetch was initially designed as a browser API, but SvelteKit has extended its functionality to work on the server as well if necessary. The warning is a reminder that creating additional server round trips can be avoided by preloading data during server-side rendering, rather than requesting it separately after the page loads.

If your function's code is not immediately executed, it may trigger a false positive situation (refer to recent issue here). Essentially, if the data needs to be fetched at a later stage, bundling the request with the initial page load becomes challenging.

(It's important to note that you should use fetch or load to obtain data, not pass it along.)

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