Qiniu JavaScript SDK

Client-side JavaScript SDK for uploading files to Qiniu Cloud Storage directly from the browser. Current stable version is 3.4.4, with 4.x in beta (adding WebWorker, mini-program, Harmony support). Supports chunked upload for files >4MB with resume capability, and image processing (thumbnailing, watermarking, etc.). Requires a server-side token for authentication. Works in IE11+, Edge, Chrome, Firefox, Safari. Compared to alternatives like AWS SDK for S3, this is the official Qiniu SDK with native Chinese documentation and regional optimizations.