DevTools

Last updated Jun 25, 2026

Using DevTools

When running your Worker locally using the Wrangler CLI ↗︎ (wrangler dev) or using Vite ↗︎ with the Cloudflare Vite plugin ↗︎, you automatically have access to Cloudflare's implementation ↗︎ of Chrome DevTools ↗︎.

You can use Chrome DevTools to:

Opening DevTools

Wrangler

  • Run your Worker locally, by running wrangler dev
  • Press the D key from your terminal to open DevTools in a browser tab

Vite

  • Run your Worker locally by running vite
  • In a new Chrome tab, open the debug URL that shows in your console (for example, http://localhost:5173/__debug)

Dashboard editor & playground

Both the Cloudflare dashboard ↗︎ and the Worker's Playground ↗︎ include DevTools in the UI.

  • Local development - Develop your Workers and connected resources locally via Wrangler and workerd, for a fast, accurate feedback loop.

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description: Debug your local and deployed Workers using breakpoints. title: Breakpoints image: https://developers.cloudflare.com/workers/observability/dev-tools/breakpoints/og.png?v=0be4a89432d27e88

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