sveltejs/kit · error

Cannot prerender a route (${route.id}) with both a `+page.sv

Error message

Cannot prerender a route (${route.id}) with both a `+page.svelte` and a `${endpoint_file}`

What it means

Prerender validation error while finalizing route metadata: a route contains both a +page.svelte and a standalone endpoint file (e.g. +server.js), and at least one of them opts into prerendering. Prerendering such a route is ambiguous because the prerenderer would fetch the endpoint while also rendering the page, so SvelteKit refuses. The message names the endpoint file that conflicts.

Source

Thrown at packages/kit/src/core/sync/create_manifest_data/index.js:512

		}
	}

	// compute the final page options for each page node
	for (const node of nodes) {
		node.page_options = node_analyser.get_page_options(node);
	}

	for (const route of routes) {
		if (route.endpoint) {
			route.endpoint.page_options = get_page_options(route.endpoint.file, cwd);
		}

		if (route.page && route.endpoint) {
			const page = nodes[route.page.leaf];
			if (page.page_options?.prerender || route.endpoint.page_options?.prerender) {
				const endpoint_file = route.endpoint.file.split('/').pop();

				throw new Error(
					`Cannot prerender a route (${route.id}) with both a \`+page.svelte\` and a \`${endpoint_file}\``
				);
			}
		}
	}

	return {
		nodes,
		routes: sort_routes(routes)
	};
}

/**
 * Determine if and how the file is relevant to the routing system.
 * @param {string} project_relative
 * @param {string} file
 * @param {string[]} component_extensions
 * @param {string[]} module_extensions

View on GitHub (pinned to 03f1687fe6)

Solutions

1. Remove `export const prerender = true` from the page and the endpoint file for this route
2. Move the endpoint logic into +page.server.js load functions instead of a separate +server.js file
3. Exclude this route from prerendering and serve it dynamically

When it happens

Trigger: Thrown at packages/kit/src/core/sync/create_manifest_data/index.js:512 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of sveltejs/kit@03f1687fe6 (2026-09-02). Data as JSON: /api/errors/c34e505d1be0f035. Report an issue: GitHub.