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JavaScript Typed Arrays, Blobs and Files Cheat Sheet

A 2-page reference for typed arrays, Blob, File and FileReader: 14 short entries with copy-ready code.

ForDevelopers

javascript-typed-arrays-blobs-and-files-cheat-sheet.pdfShowing 14 of 56 lines
// Create a typed array
const bytes = new Uint8Array([104, 105]);
const floats = new Float32Array(4);

// ArrayBuffer and views
const buf = new ArrayBuffer(8);
const view = new DataView(buf);
view.setUint16(0, 258);

// Text to bytes
const bytes = new TextEncoder().encode("héllo");

// Bytes to text
const text = new TextDecoder().decode(bytes);

What's inside

Format
PDF, Markdown
Contents
14 sections · 2 pages
Version
1.0 · Updated 3 Oct 2026
Licence
Commercial What this means
Checked
Checked before it ships
  • javascript-typed-arrays-blobs-and-files-cheat-sheet.pdfPDF · 20 KB
  • javascript-typed-arrays-blobs-and-files-cheat-sheet.mdMarkdown · 2 KB
  • LICENSE.txtadded to every download

About this item

A compact, printable reference for typed arrays, Blob, File and FileReader. Each of the 14 entries has a one-line explanation and a small example you can paste into your editor. The PDF uses a two-column A4 layout designed to sit next to your keyboard, and the same content ships as Markdown so you can search it or drop it into your notes. Every JavaScript example targets ES2023.

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