Sveltekit Cloudflare adapter Remote Binding Not Works

[dev-itzarun]

What versions & operating system are you using?

node : v24.11.1

npm : 11.6.2

sveltkit : "^2.48.4"

svelte : "^5.43.6"

wrangler : "^4.47.0"

@sveltejs/adapter-cloudflare : "^7.2.4"

Please provide a link to a minimal reproduction

https://gist.github.com/dev-itzarun/3186d9d4caa4b2a6db6bda7d5ffff759

Describe the Bug

Cloudflare remote Binding Not works in Sveltekit Cloudflare Adapter

why try to run using : npx wrangler dev

Please provide any relevant error logs

When try to run : " http://127.0.0.1:8787"

Got this :

X [ERROR] ❌ Error during D1 operation: Error: D1_ERROR: Failed to parse body as JSON, got: Error: internal error; reference = skkdqb40o25jmloafk8f93ra

      at async Object.fetch
  (file:///D:/sv-projects/test/node_modules/miniflare/src/workers/core/entry.worker.ts:440:19)
      at D1DatabaseSessionAlwaysPrimary._send (cloudflare-internal:d1-api:181:19)
      at async D1DatabaseSessionAlwaysPrimary._sendOrThrow (cloudflare-internal:d1-api:135:25)
      ... 7 lines matching cause stack trace ...
      at async Object.fetch
  (file:///D:/sv-projects/test/.svelte-kit/cloudflare/_worker.js:100:13) {
    [cause]: Error: Failed to parse body as JSON, got: Error: internal error; reference =
  skkdqb40o25jmloafk8f93ra
        at async Object.fetch
  (file:///D:/sv-projects/test/node_modules/miniflare/src/workers/core/entry.worker.ts:440:19)
        at D1DatabaseSessionAlwaysPrimary._send (cloudflare-internal:d1-api:182:24)
        at async D1DatabaseSessionAlwaysPrimary._sendOrThrow (cloudflare-internal:d1-api:135:25)
        at null.<anonymous> (async cloudflare-internal:d1-api:361:41)
        at async GET
  (file:///D:/sv-projects/test/.svelte-kit/output/server/entries/endpoints/test/_server.js:12:25)
        at async render_endpoint
  (file:///D:/sv-projects/test/.svelte-kit/output/server/index.js:255:22)
        at async resolve2
  (file:///D:/sv-projects/test/.svelte-kit/output/server/index.js:3608:23)
        at async Object.handle
  (file:///D:/sv-projects/test/.svelte-kit/output/server/chunks/hooks.server.js:32:20)
        at async fn
  (file:///D:/sv-projects/test/.svelte-kit/output/server/index.js:3473:16)
        at async internal_respond
  (file:///D:/sv-projects/test/.svelte-kit/output/server/index.js:3455:22)
        at async Object.fetch
  (file:///D:/sv-projects/test/.svelte-kit/cloudflare/_worker.js:100:13)
  }


[wrangler:info] GET /test 500 Internal Server Error (233ms)

[dev-itzarun]

Guys Need Support

Only "https://developers.cloudflare.com/workers/development-testing/#remote-bindings" Remote Binding Not works

[petebacondarwin]

Could you help us debug this by providing a link to a Github repository that is all set up with a Sveltekit app that demonstrates this behaviour? I tried recreating the problem from your gist but couldn't get SvelteKit to build the server-side code, as I don't know much about that framework.

[petebacondarwin]

I just created a new SvelteKit application using C3, then replaced the +page.svelte file with +server.ts. I updated the Wrangler config file to point to a database that I had created in my Cloudflare dashboard and ensured that Wrangler was logged into my Cloudflare account.

When I did this I could run pnpm wrangler dev and it would connect to the remote D1 database.

My Wrangler config looks like this (wrangler.json):

{
	"$schema": "node_modules/wrangler/config-schema.json",
	"name": "calm-wood-71ad",
	"main": ".svelte-kit/cloudflare/_worker.js",
	"compatibility_date": "2025-11-17",
	"compatibility_flags": [
		"nodejs_als"
	],
	"build": {
		"command": "npm run build"
	},
	"assets": {
		"binding": "ASSETS",
		"directory": ".svelte-kit/cloudflare"
	},
	"observability": {
		"enabled": true
	},
	"workers_dev": false,
	"preview_urls": false,
	"d1_databases": [
		{"binding": "MAIN",
		"database_name": "pete-test",
		"database_id": "ba415e99-0fac-4903-a834-62deb02e94bc",
		"remote": true,}
	]
}

My svelte.config.js looks like:

import adapter from "@sveltejs/adapter-cloudflare";
import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';

/** @type {import('@sveltejs/kit').Config} */
const config = {
	// Consult https://svelte.dev/docs/kit/integrations
	// for more information about preprocessors
	preprocess: vitePreprocess(),

	kit: {
		adapter: adapter({
			fallback: 'plaintext',
			routes: {
				include: ['/*'],
				exclude: ['<all>']
			},
			config: 'wrangler.jsonc'
		})
	}
};

export default config;

[dev-itzarun]

@petebacondarwin Thanks For this ,Let me Try and Update

[petebacondarwin]

Any update @dev-itzarun ?