ag‑psd is a JavaScript library that lets developers read and write Adobe Photoshop PSD files directly in Node.js or browsers. It provides functions to parse a PSD into a manipulable object (including layer canvases, text data, thumbnails, etc.) and to serialize such objects back into a valid PSD file, with optional support for canvas‑based image handling and Web‑Worker workflows. The library is aimed at web and Node developers who need to programmatically inspect, modify, or generate Photoshop documents.