+page.svelte
<script lang="ts">
let randomString = 'Hello World!';
</script>
<form method="post" action="?/test">
<button>Submit Form</button>
<input type="hidden" value={randomString} name="randomString" />
</form>
+page.server.ts
export const actions = {
test: ({ request }) => {
const { randomString } = Object.fromEntries(await request.formData());
console.log(randomString)
}
};