Question 1

How to generate a QR code with custom colors using node-qrcode?

Accepted Answer

Use the color.dark and color.light options in the renderer settings—for example, in toDataURL or toFile, specify colors in RGBA hex format like #FF0000FF for red. This allows full control over the QR code's appearance, including transparent backgrounds.

Question 2

node-qrcode vs qrcode-generator: which is better for Node.js?

Accepted Answer

node-qrcode is more feature-rich with CLI support, multiple output formats, and better Unicode handling, while qrcode-generator is often lighter but less versatile. Choose node-qrcode for cross-platform needs and advanced customization, but consider alternatives if minimal bundle size is critical.

Question 3

Can node-qrcode handle emojis in QR codes?

Accepted Answer

Yes, it supports multibyte characters including emojis by encoding them in Byte mode, as described in the multibyte characters section. However, ensure the QR code reader supports UTF-8, as ECI isn't fully implemented for guaranteed compatibility.

Question 4

How to save QR code as SVG file in Node.js?

Accepted Answer

Use the toFile method with the path having a .svg extension or set type: 'svg' in options—for example, QRCode.toFile('output.svg', 'text', { type: 'svg' }, callback). This leverages the built-in SVG renderer for scalable vector output.

Question 5

Does node-qrcode support GS1 QR codes?

Accepted Answer

It can generate GS1-compatible QR codes, but you must manually add the GS1 header metadata, as noted in the GS1 QR Codes section. The library doesn't provide built-in helpers for GS1 data structuring, requiring additional implementation.

Question 6

Is node-qrcode compatible with React Native?

Accepted Answer

Yes, but primarily with SVG output, as mentioned in the highlights. You'll need to use the SVG format and potentially handle rendering differences, as PNG support in React Native might require additional native modules or workarounds.

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