Installation

Choose the entry point that matches where your application runs. All options use the same Sythos implementation and keep the runtime dependency count at zero.

npm: the normal application path

npm install @sythos/js_barcode_universal

The package is native ESM ("type": "module") and declares Node.js 24 or newer. In a Node application, import the package root or one of its public subpaths:

import { encode, toSVG } from '@sythos/js_barcode_universal';
import { encodeQR } from '@sythos/js_barcode_universal/qr';

const matrix = encodeQR('https://www.sythos.net/', { ecc: 'M' });
const svg = toSVG(matrix, { scale: 8, margin: 4 });

The root package includes TypeScript declarations. You do not need to install the TypeScript compiler just to consume the SDK from JavaScript; install it as a development tool when your own project needs to compile TypeScript.

CDN: an IIFE <script> tag

The published IIFE bundle exposes the global SythosBarcode object. Pin a release in production so a future latest release cannot change your deployed bytes unexpectedly:

<script src="https://unpkg.com/@sythos/js_barcode_universal"></script>
<script>
  const matrix = SythosBarcode.encode('https://www.sythos.net/', {
    format: 'qr',
  });
  const image = SythosBarcode.toSVGDataURI(matrix, { scale: 8 });
  document.querySelector('#barcode').src = image;
</script>
<img id="barcode" alt="Generated QR code">

The repository’s IIFE bundle is the same browser surface used by the package. It also works from a local HTML file, while camera access still follows browser permission and secure-context rules.

CDN or local ESM

Use the ESM bundle when the page already uses modules:

<script type="module">
  import {
    encode,
    toSVGDataURI,
  } from 'https://unpkg.com/@sythos/js_barcode_universal/bundle/sythos-barcode.esm.js';

  const matrix = encode('ESM-START', { format: 'qr' });
  document.querySelector('#barcode').src = toSVGDataURI(matrix, { scale: 6 });
</script>
<img id="barcode" alt="Generated QR code">

For a checked-in, offline-friendly copy, import bundle/sythos-barcode.esm.js from the repository or package archive instead of relying on a network request at runtime.

Browser examples

The canonical examples are already part of the repository:

• Create uses the IIFE bundle to render symbols and lets the user choose a payload and format.
• Read accepts image input and demonstrates the progressive camera profile.

They are plain HTML files. Opening the create example from file:// is enough for generation. Camera reading normally requires HTTPS or localhost, a browser permission grant and a frame that contains enough detail for the selected format.

TypeScript projects

The package’s declarations are available automatically from the root import:

import { encode, type BitMatrix } from '@sythos/js_barcode_universal';

const symbol: BitMatrix = encode('TS-INSTALL', { format: 'qr' });

The SDK’s own development workspace pins its TypeScript compiler exactly, but that compiler is not a dependency of the published runtime. Your application may choose its own compatible TypeScript toolchain.

Source layout for contributors

The package publishes readable source alongside the compiled runtime:

• src/ts/ contains the TypeScript implementation and declarations;
• src/js/ contains the compiled JavaScript modules used by consumers;
• src/index.js and src/index.d.ts are the stable root facades;
• bundle/ contains the committed IIFE and ESM bundles.

From a development checkout, npm run build:ts regenerates the JavaScript facade and compiled modules. Type and public-API checks are available through npm run types and npm run types:api. These commands are contributor checks, not installation steps for an application using the package.

Common installation surprises

“It tried to install another barcode library”

The SDK has no runtime dependencies. Check the application lockfile and the command that installed it; development tools are separate from the published runtime graph.

“The browser module does not load”

Use type="module" for the ESM bundle or the IIFE bundle for a classic <script> tag. Do not mix the two loading styles in the same snippet.

“The camera is blocked”

Camera access is a browser capability, not an npm installation feature. Use HTTPS or localhost, grant permission, and make sure the page is not inside a context that forbids camera access. See the read example and the security policy before treating an empty decode as a software installation failure.