JavaScript Blob_files Guide
Blob represents binary data. The File API provides access to user-selected files with name, size, and type metadata. The guide walks through Blob & File API. `new Blob(["data"],{type:"text/plain"})` — create. `blob.text()`, `blob.arrayBuffer()`, `blob.stream()`. `URL.createObjectURL(blob)` — blob URL for preview. File from input: `input.files[0]`. File properties: name, size, type, lastModified. Modern Blob methods replace FileReader. The guide is organized into 1 sections that build on each other, each pairing a prose explanation with runnable code. Related guides: Arrays, Strings, Numbers, Math, Date. This is one of 145 JavaScript guides on JS Reference — see the full list on the guides page. Practice what you learn in the JavaScript playground, and look up any unfamiliar term in the JavaScript glossary.