Cloudflare Workers
Create, run locally and deploy your first Cloudflare Worker
A way to run small server-side JavaScript programs on Cloudflare. Start with a Hello World Worker and a preview address.
Written from the tool's official pages, listed under Official sources at the end of this guide. Check them for current features, limits and terms.
Try it (opens in a new tab)Steps to try
- Create a Cloudflare account and check the docs' prerequisites, including a current Node.js, before starting.
- In an empty folder, run npm create cloudflare@latest and follow the prompts to generate a project from a template.
- Run npx wrangler dev and open the local address it prints; it may ask you to log in through the browser the first time.
- Edit src/index.js to change the Response text, save, reload, and confirm the output changed.
- Run npx wrangler deploy. Setting a workers.dev subdomain is optional; a custom domain is a separate decision you can skip for a first test.
- Keep the project in Git and put no API keys in code; use the docs' pages on secrets and environment variables.
Limitations
A Hello World Worker is not a production site. If you see 523 errors on a brand-new workers.dev address the docs say to wait a minute. Bindings, storage, testing and limits need their own reading.
Pricing
The docs point to a separate limits and pricing page. Free allowances, paid plans and limits change, so read the current Cloudflare terms before relying on a deployment.
Privacy and data
Deploying publishes code to a public address and links the project to your Cloudflare account. Do not commit secrets or customer data, and check what each logged-in command can change before running it.
About the sources
Based on the vendor's published documentation, not hands-on testing. Bindings, storage and limits are not covered.
Alternatives
Other static and serverless hosts exist. Static assets, Pages migration and framework guides on the same docs may fit a plain website better than a Worker script.
Official sources
The official pages this guide was written from. Read them for current features, limits and terms.