📇 QR Code

Generate QR codes in Deno, as base64-encoded images, completely dependency-free and requires no binary.

This is a port of zenozeng/node-yaqrcode, which itself is a port of the QR code generator in the d-project.

⭐ Getting started

import { qrcode } from "https://deno.land/x/qrcode/mod.ts";
const base64Image = await qrcode("bitcoin:ADDRESS?amount=0.5&label=ORDER"); // data:image/gif;base64,...

You can also add a custom size by specifying size in the second parameter:

const fixedSizeImage = await qrcode("bitcoin:ADDRESS?amount=0.5&label=ORDER", { size: 500 });

Deno.serve example

The examples/server.ts file exposes QR codes over HTTP using Deno.serve:

deno run --allow-net examples/server.ts

Then open a URL like this to receive a GIF response:

http://localhost:4000/?data=Hello%20World!&size=250&typeNumber=5&errorCorrection=L

Short query parameters are also supported for compact URLs: d, s, v, and e.

CLI with DPX

After installing DPX, you can directly use the CLI using the dpx command:

dpx qrcode <text>

CLI

Alternatively, you can use it directly from the CLI by using deno run:

deno run https://deno.land/x/qrcode/cli.ts <text>

You can also install it globally using the following:

deno install https://deno.land/x/qrcode/cli.ts

Then, the package is available to run:

qrcode <text>

👩‍💻 Development

Run tests:

deno test

Notes

• To support typeNumber 40, use the RS_BLOCK_TABLE from davidshimjs/qrcodejs
• To support UTF-8, use the code from davidshimjs/qrcodejs
• Returns a base64-encoded image URL

⭐ Related Work

• zenozeng/node-yaqrcode is the Node.js project that is the origin of this implementation

📄 License

• MIT © Denorg
• Original repo: MIT © Zeno Zeng
• "QR Code" is registered trademark of Denso Wave

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