Svelte POST API

+page.svelte

<script type="ts">
	import { onMount } from 'svelte';

	let title: string;

	onMount(() => {
		try {
			fetch('/api/post', {
				method: 'post',
				headers: { 'Content-Type': 'application/json' },
				body: JSON.stringify({ title: 'Svelte API POST' })
			})
				.then((response) => response.json())
				.then((data) => {
					title = data.body.title;
				})
				.catch((error) => {
					console.error('error', error);
				});
		} catch (error) {
			console.error('error', error);
		}
	});
</script>

{#if title}
	<p>{title}</p>
{/if}

api__post__+server.js

export async function POST({ request }: { request: Request }) {
	// https://bit.ly/3yEls4L
	const body = await request.json();

	try {
		return new Response(JSON.stringify({ body }), {
			status: 200
		});
	} catch (error) {
		console.error('error', error);
	}
}