Examples

Examples

The examples/ directory contains working sample apps that exercise the SDK end-to-end. They double as integration smoke tests and as reference material for users.

Running an Example

From inside an example directory (e.g. examples/minimal/):

npm run dev    # Start wrangler dev (builds Docker on first run)

The first run builds the container image, so it's slow. Subsequent runs reuse the image unless the SDK or Dockerfile changes. If you've changed the container runtime or SDK, run npm run docker:rebuild from the repo root before npm run dev.

Available Examples

EXPOSE Directives

The Cloudflare containers primitive does not require EXPOSE directives — all ports are accessible in both local dev and production without them.

Including EXPOSE is still recommended in example Dockerfiles because it documents which ports the app uses (standard Docker convention). Don't add it expecting it to gate access; add it as documentation.

Adding a New Example

1. Copy examples/minimal/ as a starting point. 2. Update package.json name and any wrangler config (wrangler.jsonc) — class names, DO bindings, container image tag. 3. Add a README.md with an # H1 title (the README scanner uses it) and a short description of what the example demonstrates. 4. Make sure the example builds and npm run dev works from a clean checkout. 5. If the example demonstrates a new SDK capability, link to it from packages/sandbox/README.md.

Local Development Tips

• Examples link to @cloudflare/sandbox via the workspace, so SDK changes are picked up after a build (npm run build from repo root).
• Container changes require npm run docker:rebuild to take effect.
• If you hit stale-image issues, delete the container image (docker images | grep sandbox) and re-run npm run dev.