Recently I needed to crop user-uploaded avatars for a project, with support for drag-to-adjust crop areas. I looked at a few existing libraries—eit…

I recently built an image format converter and discovered that browser-side image conversion, while seemingly simple, has many technical details wo…

Last week during a project optimization, I discovered user avatars were often 5-10MB each. Uploading these directly to the server was wasting bandw…

I recently worked on an image upload feature that needed preview and Base64 conversion. Thought it was just calling an API, but ended up hitting se…

Managing icons in frontend projects is always a hassle. Designers send a bunch of SVGs, developers manually import, name, and wrap them. Recently d…

When debugging APIs, you’ve surely encountered various HTTP status codes. 200 OK is straightforward, but what about 401, 403, or 500? What’s the di…

Recently, while debugging a production issue, I noticed our API responses were painfully slow. Opening DevTools revealed the culprit: `Cache-Contro…

Tool link: https://jsokit.com/tools/html-format

Building a content management system recently, I needed to safely display user-submitted text on pages. Direct rendering? XSS attacks await. Escape…

While building a file verification tool recently, I revisited hash algorithms. Many developers know terms like MD5 and SHA, but few understand the …