Cloudflare Workers Playground

What Cloudflare Workers Playground is

Cloudflare Workers Playground is a browser sandbox for previewing and testing a Worker without setup or authentication. The editor refreshes the preview beside the code as changes are made. An HTTP panel lets users send raw requests and edit headers and bodies, while type checking uses JSDoc comments and workers-types. A lightweight log viewer displays console output, including primitive values, objects, and arrays, and can be cleared between runs; it does not support class instances or their properties. Users can copy a unique link to share code and its preview, and shared links do not expire. The Playground can deploy a Worker to a unique URL on Cloudflare’s global network. People who are not logged in complete first-time onboarding before reviewing and deploying. Support is limited to Firefox and Chrome desktop browsers; Safari displays a PreviewRequestFailed error. Cloudflare points users who need full debugging capabilities to local development with Wrangler. Workers has a Free plan by default, while the Paid plan costs a minimum of $5 USD per month per account.

Who it suits

It suits developers who want to preview, test, share, or deploy a Worker from a browser sandbox. Users needing full debugging capabilities are directed to local development with Wrangler.

Limits

The free Playground is a browser sandbox limited to Firefox and Chrome desktop. The log viewer cannot display class instances or their properties; full debugging capabilities require local Wrangler development.

Getting started

1. Visit https://developers.cloudflare.com/workers/playground/.
2. Open the browser sandbox in Firefox or Chrome on desktop.
3. Edit code in the editor and inspect the live preview beside it.
4. Use the HTTP panel to send a request or the log viewer to inspect console output.
5. Copy a unique link to share the code and preview, or deploy the Worker to a unique URL.
6. If not logged in, complete first-time onboarding before reviewing and deploying.

Verdict

The Playground supports quick browser-based Worker workflows, including preview, HTTP requests, sharing, and deployment. Its browser and logging limits matter for developers who need broader debugging support.