Debugging the Browser Camera API

Tue, 06 Jan 2026 09:49:47 -0600

I’ve been adding a feature to Garbs.net that lets you take photos directly from the browser using the ImageCapture API.

It was working great on my Pixel 9a, but when my sister tested on her Galaxy S21, all our closeup test shots were coming out blurry. The issue? Her phone has an extra ultrawide lens with a fixed focus, and my code wasn’t picking the correct camera.

After some digging, I discovered that Camera 0 (the “Main” camera) was being returned as index 3 or 4 on her device. The camera enumeration order isn’t consistent across phones.

TIL: HTML Error Responses Can Crash Wails JavaScript Bindings

Wed, 06 Aug 2025 00:00:00 +0000

Problem: I was working on a Wails desktop application and had the Go backend upload a photo to my own API (another service). When the photo failed to upload I didn’t catch that my own upload endpoint was returning an HTML error response instead of JSON. This caused the Javascript VM to show “NeedDebuggerBreak trap” and promises never resolved.

Solution: I didn’t fully debug whether the issue was because the HTML was too large or special characters in the response were causing an issue. The solution was to have the API return a proper JSON response.

Debugging on Carlos Urreta's Weblog

Debugging the Browser Camera API

TIL: HTML Error Responses Can Crash Wails JavaScript Bindings