@wybaby168

Yu Wang

@wybaby168Osaka, JapanJoined July 2026

CTO at Flyfish. Building File Viewer in the browser.

About

I build File Viewer: 206 file extensions, 24 browser-side pipelines, no upload. I write about Workers, WASM, CSP, and the bugs that waste whole days.

Available for

Browser/WASM debugging, private deployments, integrations, and sponsorship.

Yu Wang's blogs

File Viewerfile-viewer.hashnode.dev1 post

Self-Hosting a Browser File Viewer Under a Strict CSP: Workers, WASM, and Assets Without Public CDNs

File Viewer began with a consumer-facing application whose backend resources were limited. In 2022, my manager asked me to move document preview entirely into the frontend. That constraint eventually

Jul 13 · 10 min readfile-viewer.hashnode.dev

Yu Wang

About

Available for

Yu Wang's blogs

Self-Hosting a Browser File Viewer Under a Strict CSP: Workers, WASM, and Assets Without Public CDNs

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Yu Wang

About

Available for

Yu Wang's blogs

Self-Hosting a Browser File Viewer Under a Strict CSP: Workers, WASM, and Assets Without Public CDNs