---
title: Easier debugging in Workers with improved Wrangler error screen
description: Wrangler's error screen now features light and dark themes, more reliable source map resolution, and better error cause display.
image: https://developers.cloudflare.com/changelog-preview.png
---

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## Easier debugging in Workers with improved Wrangler error screen

Aug 19, 2025 

[ Workers ](https://developers.cloudflare.com/workers/) 

Wrangler's error screen has received several improvements to enhance your debugging experience!

The error screen now features a refreshed design thanks to [youch ↗](https://www.npmjs.com/package/youch), with support for both light and dark themes, improved source map resolution logic that handles missing source files more reliably, and better error cause display.

| Before                                                                                               | After (Light)                                                                                                         | After (Dark)                                                                                                       |
| ---------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------ |
| ![Old error screen](https://developers.cloudflare.com/_astro/old-error-screen.yurLWiKb_Z1vn3jq.webp) | ![New light theme error screen](https://developers.cloudflare.com/_astro/new-error-screen-light.CcroERTP_2f4pOC.webp) | ![New dark theme error screen](https://developers.cloudflare.com/_astro/new-error-screen-dark.BIDA2RGg_Q0JqP.webp) |

Try it out now with `npx wrangler@latest dev` in your Workers project.

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