---
description: Wrangler's error screen now features light and dark themes, more reliable source map resolution, and better error cause display.
title: Easier debugging in Workers with improved Wrangler error screen
image: https://developers.cloudflare.com/changelog/post/2025-08-19-improved-wrangler-error-screen/og.png?v=d07fa55cf7914ba5
---

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August 19, 2025

## Easier debugging in Workers with improved Wrangler error screen

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

Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/changelog/post/2025-08-19-improved-wrangler-error-screen/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

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/cdn-cgi/image/onerror=redirect,width=990,height=1500,format=webp/_astro/old-error-screen.yurLWiKb.png) | ![New light theme error screen](https://developers.cloudflare.com/cdn-cgi/image/onerror=redirect,width=990,height=1500,format=webp/_astro/new-error-screen-light.CcroERTP.png) | ![New dark theme error screen](https://developers.cloudflare.com/cdn-cgi/image/onerror=redirect,width=990,height=1500,format=webp/_astro/new-error-screen-dark.BIDA2RGg.png) |

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

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