Cloudflare

Ecosystem

Cloudflare Workers is the SDK's main runtime. The SDK finds the resources your app uses. It creates the bindings and deploys to your Cloudflare account.

On this pageUnderstand which bindings the SDK creates for you · Add your own Cloudflare configuration when you need it · Deploy straight to your own Cloudflare account

Bindings

This section shows how to read bindings in your code. In SDK routes and middleware, use c.env:

// routes/api/users.ts
import { defineHandler } from 'void';

export const GET = defineHandler(async (c) => {
  const { results } = await c.env.DB.prepare('SELECT * FROM users').all();
  return c.json({ users: results });
});

TanStack Start and React Router can import bindings from cloudflare:workers:

import { env } from 'cloudflare:workers';

const { results } = await env.DB.prepare('SELECT * FROM users').all();

Other frameworks have their own way to read bindings. Follow your framework's setup guide.

TypeScript setup

Add void/env to your TypeScript types:

{
  "compilerOptions": {
    "types": ["void/env"]
  }
}

This adds types for your bindings and for the Workers runtime.

Available bindings

Binding	Resource	Use in your app
DB	D1	c.env.DB or void/db
KV	KV	c.env.KV or void/kv
STORAGE	R2	c.env.STORAGE or void/storage
AI	Workers AI	c.env.AI or void/ai
QUEUE_*	Queues	defineQueue() or void/queues
Filename-derived	Durable Objects	A module in durable-objects/

To enable, disable or rename an inferred binding, use binding configuration

Cloudflare configuration

Show cloudflare configuration

Define Worker settings in void.config.ts:

import { defineConfig } from 'void/config';

export default defineConfig({
  worker: {
    compatibility_date: '2026-02-24',
    compatibility_flags: ['nodejs_compat'],
  },
  cloudflare: {
    name: 'my-app',
    services: [{ binding: 'API', service: 'my-api-worker' }],
  },
});

Put binding arrays, resource IDs, routes and service bindings under cloudflare. The SDK keeps the bindings you set and adds any missing inferred resources. For compatibility settings and variables, the worker field wins. See Configuration.

Commit void.lock.json when the SDK records resource IDs or Durable Object migrations. Keep generated Cloudflare config out of Git. Some frameworks need an adapter config path. They use .void-wrangler.jsonc, and their setup guides list the options.

Declare environment variables in env.ts. Put local values in .env. Set production server values with void secret put. See Environment Variables.

Deploy to your own Cloudflare account

Requires: Cloudflare login (in the browser)

The first deploy opens your browser to sign in to Cloudflare. CI uses CLOUDFLARE_API_TOKEN from its secret store. Never put a token in project files.

Choose Cloudflare during void init. Now you will deploy the app.

void deploy

Example output: build and upload progress, then the live URL.

The SDK opens your browser to sign in. If you have several accounts, it asks which one to use. If the browser does not open, follow the link and confirm the code shown in the terminal.

To set up deployment later, run void connect --platform cloudflare. Now you will pick Cloudflare for a single deploy.

void deploy --platform cloudflare

Example output: build and upload progress, then the live URL.

Manage your session with void cloudflare login, status and logout.

Deploy an existing Worker

This section moves an existing Worker under the SDK. Keep the app's root wrangler.jsonc or wrangler.json. Now you will deploy the app.

void deploy

Example output: build and upload progress, then the live URL.

If no destination is set, the SDK offers to link the existing Worker. Accept to sign in and deploy. The SDK moves the configuration into void.config.ts and void.lock.json. Bindings, variables, secrets, routes and schedules are kept. Commit both files.

Keep the first deploy limited to the existing app. Add resources, auth, migrations and other features after linking. If the Worker has a newer inactive upload, activate or remove it in Cloudflare, then retry.

Readiness checks need an existing version metadata binding or access to Version URLs. If neither is available, the SDK stops before activation.

Prerendered pages may need a new ISR cache. The SDK asks whether to enable it and saves your choice as routing.isr. Choose false to render those pages on every request. In CI, set this choice before you deploy. Existing caches keep their IDs.

If linking reports a missing binding, add the Worker's binding name and resource ID to cloudflare and inference.bindings. Keep .void/cloudflare-link.json when you retry.

Before you change dashboard-managed triggers or visibility, add the current routes, workers_dev and preview_urls to your config. Convert wrangler.toml to JSON or JSONC before linking. Each named environment needs its own SDK project config.

What happens during deploy

Each deploy runs these steps in order:

1. Create missing resources.
2. Build the app.
3. Check secrets and migrations.
4. Upload the Worker.
5. Verify readiness.
6. Update traffic and triggers.

Resource IDs are saved in void.lock.json.

A failed build or check can leave new resources in your account. Run the first deploy from one machine only. Commit the lock file before you deploy from other machines or CI.

Apps that send email need email.from in void.config.ts. The SDK checks the domain setup before building. It asks before it changes anything. See Email.

Deploying from CI

Store these values in your CI secret store as needed:

Name	When needed
CLOUDFLARE_API_TOKEN	Required. Workers Scripts: Edit, read access to bound resources, and edit access to products the SDK provisions.
CLOUDFLARE_ACCOUNT_ID	When the token can access several accounts.
DATABASE_URL	PostgreSQL and MySQL provisioning and migrations.
CLOUDFLARE_WORKERS_SUBDOMAIN	When the Worker has no version preview URL. Use my-team or my-team.workers.dev.
CF_ACCESS_CLIENT_ID, CF_ACCESS_CLIENT_SECRET	When Cloudflare Access protects the readiness URL.

For email, run void email setup --platform cloudflare locally. Commit void.lock.json, then pass --require-email in CI. The token also needs Email Routing Edit and Email Sending Edit.

Cloudflare Access

You can deploy locally to an Access-protected Worker with a short-lived user session. Now you will fetch an Access token into your shell.

export CF_ACCESS_TOKEN="$(cloudflared access token --app=https://<worker>.<account>.workers.dev)"

Example output: no output. The token is stored in CF_ACCESS_TOKEN for this shell only.

Use the same terminal window

CF_ACCESS_TOKEN only exists in the terminal where you exported it. Run the next deploy step (for example void deploy --platform cloudflare) in that same window.

The SDK uses Access credentials for readiness checks and does not save them. If a check is denied, the deploy fails. On a first deploy, the bootstrap version may already be live behind Access at that point.

Databases and secrets

For PostgreSQL and MySQL, pass DATABASE_URL to the deploy process. The SDK uses it for Hyperdrive and migrations. It never writes the value to config. MySQL schema changes can partly apply before an error. See failed MySQL migrations.

Creating Hyperdrive needs an API token with Hyperdrive edit permission. You can also create it in Cloudflare and add its ID to cloudflare.hyperdrive. An existing binding works with browser login.

Run void db generate and commit the migrations before you deploy schema changes. This includes Better Auth tables. Custom D1 migration folders, tables and patterns are supported. The deploy stops if the files to apply differ from the checked history.

Set production server values with void secret put <NAME>. The SDK keeps existing remote secrets. It creates BETTER_AUTH_SECRET when an auth app needs one. Local .env values are never deployed.

Readiness and rollback

The SDK checks each uploaded version before it sends traffic there. If the readiness check or trigger update fails, it restores the previous deploy. Finish or cancel any gradual rollout in Cloudflare before you deploy with the SDK.

Some Durable Object Workers cannot be staged by Cloudflare. Review the changes first. Now you will deploy them as one atomic release.

void deploy --platform cloudflare --atomic

Example output: build and upload progress, then the live URL. The release switches only after every part succeeds.

To make every deploy atomic, set deploy: { cloudflare: { mode: 'atomic' } }. An atomic deploy sends traffic to the new version before its readiness check. Durable Object class migrations cannot be rolled back past their migration boundary.

A new Worker may need a live first deploy before readiness can be checked. If a staged upload fails, keep .void/cloudflare-candidate.json. You can then retry from the same checkout.

Now you will check the current deployment and roll back to an earlier version.

void project status
void project rollback [version]

Example output: The active version and its status. A confirmation that traffic now goes to the selected version.

Rollback restores the recorded triggers along with the code. Versions without a full trigger snapshot keep the current routes and schedules. Rollback does not undo database migrations.

Scope and limitations

The SDK deploys native apps, static sites, SPAs and supported SSGs. It also deploys Cloudflare builds from TanStack Start, React Router, SvelteKit, Nuxt, Analog and Astro. The vinext adapters are experimental.

• Native apps support the SDK routing rules. Framework apps on the direct target set redirects, rewrites, fallbacks and headers in their framework or Worker.
• --skip-build works for existing static output. Worker apps require a fresh build.
• Named Cloudflare environments are not supported. Use a separate SDK project config for each target.
• Sandbox requires Workers Paid and Docker. See Sandbox requirements for plan and token permissions.
• Email to arbitrary recipients requires Workers Paid; verified recipients and inbound mail work on Workers Free. See Email.
• Node.js, Bun, and Deno use their own deployment path.

Commit the Durable Object migration history in void.lock.json. Never delete or reorder steps that are already deployed.

Managing the deployed app

void secret, void domain, void project status|list|logs|rollback and remote void db commands use the selected account and Worker. Logs show a live tail.

Custom domain commands update routes right away. A first deploy can time out while DNS or TLS propagates. If it does, check the domain in Cloudflare. Retry once /__void/ready responds.

void project delete does not remove Cloudflare resources. Check who owns them, then remove them in Cloudflare.

Local development

Local D1, KV and R2 bindings use local data. Production resource IDs are only used when you deploy.

Workers AI runs remotely once you connect to Cloudflare. Development calls count against your account's allowance. Remote bindings in dev and preview use your void cloudflare login session. If CLOUDFLARE_API_TOKEN is set, they use that instead.

AI on your Cloudflare account

ai.run(), ai.stream() and ai.image() use your Workers AI binding. For provider models, set up your AI Gateway in config first:

import { defineConfig } from 'void/config';

export default defineConfig({
  ai: { gateway: 'my-gateway' },
});

Now you will store the provider key as a Worker secret.

void secret put OPENAI_API_KEY

Example output: a prompt for the value, then a confirmation that the secret is saved. The value is never printed.

ai.provider('openai').fetch(...) then uses that gateway and key. See the AI guide for examples. Use AI Gateway analytics to inspect account usage.

ISR on your Cloudflare account

Set up revalidation globally, per path or per page. The SDK creates the cache for you.

revalidate() clears shared storage and the edge cache in the current data center. Other data centers can serve cached responses until their cache expires. If a data center has not rendered the HTML yet, its Pages data requests are generated live.

Each deploy starts with a fresh cache.

Next steps

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