Use your package manager to install:
npm install --save-dev @castlenine/svelte-qrcode
<script>
import QRCode from '@castlenine/svelte-qrcode';
</script>
<QRCode data="Hello world!" />
Many new features have been added to version 2.0.0, and some properties have been renamed.
Here is a list of the changes:
Old property name | New property name | Note |
---|---|---|
content |
data |
|
errorCorrection |
errorCorrectionLevel |
|
base64Image |
logoInBase64 |
|
logoWidth |
logoSize |
logoSize is applied to logoWidth and logoHeight (new property) |
dispatchDownloadLink |
dispatchDownloadUrl |
Old event name | New event name |
---|---|
downloadLinkGenerated |
downloadUrlGenerated |
The data encoded in the QR code typically consists of a URL to a website or a code used by applications, such as handling secrets in time-based one-time password (TOTP) applications.
This is the only property required to generate the QR code.
Property name | Type | Required |
---|---|---|
data |
string |
Yes |
<QRCode data="https://duxreserve.com" />
The QR code type number, an integer ranging from 1 to 40, determines the QR code's data capacity. The default value is 0
, which allows for automatic detection.
Property name | Type | Default value |
---|---|---|
typeNumber |
Integer number between 0 and 40 |
0 |
Note: In most cases, setting this property is unnecessary. However, if you need to generate a QR code with a specific type number, you can set it as follows:
<QRCode data="https://duxreserve.com" typeNumber={4} />
QR Code has error correction capability to restore data if the code is dirty or damaged. Four error correction levels are available to choose according to the operating environment. Raising this level improves error correction capability but also increases the amount of data QR Code size and reduces the QR code's data capacity.
To select error correction level, various factors such as the operating environment and QR Code size need to be considered. Level Q
or H
may be selected for factory environment where QR Code get dirty, whereas Level L
may be selected for a clean environment with the large amount of data. Typically, level M
(15%) is most frequently selected.
L
Approx 7%M
Approx 15% (default value)Q
Approx 25%H
Approx 30%Property name | Type | Default value |
---|---|---|
errorCorrectionLevel |
'L' , 'M' , 'Q' , 'H' |
'M' |
<QRCode data="https://duxreserve.com" errorCorrectionLevel="L" />
<QRCode data="https://duxreserve.com" errorCorrectionLevel="M" />
<QRCode data="https://duxreserve.com" errorCorrectionLevel="Q" />
<QRCode data="https://duxreserve.com" errorCorrectionLevel="H" />
You can customize the colors of the QR code using hexadecimal color codes or CSS color keywords such as 'transparent'
and 'red'
.
Property name | Type | Default value | Note |
---|---|---|---|
backgroundColor |
string |
'#ffffff' |
|
color |
string |
'#000000' |
Will be apply to modulesColor ,anchorsOuterColor and anchorsInnerColor if they are not defined |
modulesColor |
string |
Same as color property |
|
anchorsOuterColor |
string |
Same as modulesColor property |
|
anchorsInnerColor |
string |
Same as anchorsOuterColor property |
<QRCode data="https://duxreserve.com" backgroundColor="#009900" color="#ffffff" />
<QRCode data="https://duxreserve.com" backgroundColor="black" modulesColor="#ffffff" anchorsOuterColor="red" anchorsInnerColor="#00ff00" />
You have two options to customize the QR code shape: 'square'
and 'circle'
.
Set the haveBackgroundRoundedEdges
property to true
to round the edges of the QR code background.
Set the haveGappedModules
property to true
to create gaps between the modules.
Property name | Type | Default value |
---|---|---|
shape |
'square' , 'circle' |
'square' |
haveBackgroundRoundedEdges |
boolean |
false |
haveGappedModules |
boolean |
false |
<!-- No need to set the shape for `square` (default value) -->
<QRCode data="https://duxreserve.com" />
<QRCode data="https://duxreserve.com" shape="circle" />
<QRCode data="https://duxreserve.com" haveBackgroundRoundedEdges />
<QRCode data="https://duxreserve.com" haveGappedModules />
If isJoin
is set to true
, the QR code will be generated as a single SVG element. If set to false
, each square will be an individual SVG element.
The isJoin
property is useful for performance optimization, especially when generating a large number of QR codes. However, the colors of the anchors and modules will not differ, and the shape can only be 'square'
when isJoin
is set to true
.
Note: Most of the cases, you don't need to set this property to true
.
Property name | Type | Default value |
---|---|---|
isJoin |
boolean |
false |
<QRCode data="https://duxreserve.com" isJoin />
If isResponsive
set to true
, the QR code will be responsive and adapt to the available space in its parent element.
Property name | Type | Default value |
---|---|---|
isResponsive |
boolean |
false |
<div style="width: 30%; height: 30%;">
<QRCode data="https://duxreserve.com" isResponsive />
</div>
You can adjust the padding and size of the QR code. Increasing the size enhances the ease of scanning.
The padding
is measured in "module units", while the size
, width
and height
are in pixels.
Note: It's recommended to use a square-like QR code if you prefer different width
and height
values. Test the QR code with different sizes to ensure it is scannable.
Property name | Type | Default value | Note |
---|---|---|---|
padding |
number (module unit) |
1 "module unit" |
1 padding = 1 module unit |
size |
number (pixel) |
256 pixels |
Will be apply to width and height if they are not defined |
width |
number (pixel) |
Same as size property |
|
height |
number (pixel) |
Same as size property |
<QRCode data="https://duxreserve.com" padding={5} size={1000} />
<QRCode data="https://duxreserve.com" padding={5} width={1000} height={800} />
You can add a logo to the center of the QR code; it will be automatically scaled to fit and inserted in the generated SVG.
If you don't set logoInBase64
or logoPath
, the logo will not be displayed. You can use either logoPath
or logoInBase64
to specify the logo image. Use logoInBase64
instead of logoPath
for faster logo loading times. If you use logoInBase64
, the logoPath
property will be ignored. There is no validation of the base64 encoding for logoInBase64
; ensure it is valid.
logoPath
can be either a local path or a URL. Typically, the logo file is located in the static folder. If the path is incorrect or undefined, the logo will not be displayed. It uses the Fetch API to load the image; therefore, if the URL is external, it must be CORS-enabled. There may be a slight delay in loading the image when using logoPath
. You can set waitForLogo
to true
to ensure the logo loads before the QR code is rendered.
If you don't set logoBackgroundColor
, the logo will have the same background color as the QR code.
Note: There is no validation of the base64 encoding for logoInBase64
; ensure it is valid.
Property name | Type | Default value | Note |
---|---|---|---|
logoInBase64 |
base64 (image) string |
'' (no logo) |
|
logoPath |
string |
'' (no logo) |
|
logoBackgroundColor |
string |
'' (same as the QR Code backgroundColor property) |
|
logoPadding |
number (module unit) |
1 "module unit" |
1 logoPadding = 1 module unit |
logoSize |
number (pixel) |
15 % of the QR code size property |
Will be apply to logoWidth and logoHeight if they are not defined |
logoWidth |
number (pixel) |
Same as logoSize property |
|
logoHeight |
number (pixel) |
Same as logoSize property |
|
waitForLogo |
boolean |
false |
<QRCode data="https://duxreserve.com" logoPath="/logo/lightning.svg" />
<!-- External URL -->
<QRCode data="https://duxreserve.com" logoPath="https://upload.wikimedia.org/wikipedia/commons/a/a8/Lightning_bolt_simple.png" />
<!-- WaitForLogo -->
<QRCode data="https://duxreserve.com" logoPath="https://upload.wikimedia.org/wikipedia/commons/a/a8/Lightning_bolt_simple.png" waitForLogo />
<!-- logoInBase64 -->
<QRCode data="https://duxreserve.com" logoInBase64="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMiIgaGVpZ2h0PSIzMiIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBmaWxsPSJjdXJyZW50Q29sb3IiIGQ9Im0xOC40OTYgMTAuNzA5bC04LjYzNiA4Ljg4Yy0uMjQuMjQ2LS42MzgtLjAzOS0uNDgyLS4zNDVsMy4wNzQtNi4wNjZhLjMuMyAwIDAgMC0uMjY4LS40MzZINS43MThhLjMuMyAwIDAgMS0uMjE0LS41MWw4LjAxLTguMTE1Yy4yMzItLjIzNS42MTguMDIzLjQ4OS4zMjhMMTEuNzA2IDkuODZhLjMuMyAwIDAgMCAuMjguNDE3bDYuMjkxLS4wNzhhLjMuMyAwIDAgMSAuMjIuNTA5Ii8+PC9zdmc+" />
<!-- logo background color -->
<QRCode data="https://duxreserve.com" logoPath="/logo/lightning.svg" logoBackgroundColor="#ff0000" />
<!-- logo padding -->
<QRCode data="https://duxreserve.com" logoPath="/logo/lightning.svg" logoPadding={2} />
<!-- logo size -->
<QRCode data="https://duxreserve.com" logoPath="/logo/lightning.svg" logoSize={20} />
<QRCode data="https://duxreserve.com" logoPath="/logo/lightning.svg" logoWidth={20} logoHeigh={15} />
You can download the QR code as a file ('svg'
| 'png'
| 'jpg'
| 'jpeg'
| 'webp'
) by using an anchor tag that initiates the download. To enable this functionality, set the dispatchDownloadUrl
property to true
and listen for the downloadUrlGenerated
event to retrieve the download URL. You can choose the file format by setting the downloadUrlFileFormat
property to 'svg'
(default), 'png'
, 'jpg'
, 'jpeg'
, or 'webp'
.
Add the download
attribute to the anchor tag to specify the filename for the downloaded file. The extension is optional in the file name; the file format will be determined by the downloadUrlFileFormat
property.
Additionally, include the target="_blank"
attribute in the anchor tag to open the download in a new tab.
Note: You cannot use the downloadUrlFileFormat
other than 'svg'
in a non-browser environment.
Property name | Type | Default value |
---|---|---|
dispatchDownloadUrl |
boolean |
false |
downloadUrlFileFormat |
'svg' , 'png' , 'jpg' , 'jpeg' , 'webp' |
'svg' |
<script>
import QRCode from '@castlenine/svelte-qrcode';
let downloadUrl = '';
const handleDownloadUrlGenerated = (url = '') => {
downloadUrl = url;
};
</script>
<div>
<QRCode
data="https://duxreserve.com"
logoPath="/logo/lightning.svg"
downloadUrlFileFormat="png"
dispatchDownloadUrl
on:downloadUrlGenerated={(event) => handleDownloadUrlGenerated(event.detail.url)}
/>
</div>
{#if downloadUrl}
<a href={downloadUrl} download="QR-code-filename.png" target="_blank">Download QR Code</a>
{/if}
You can listen for the following events:
qrCodeGenerated
: The QR Code is successfully generatedqrCodeRegeneratedWithLogo
: The QR Code is successfully regenerated with the logoqrCodeGenerationFailed
: The QR Code generation failed. The error message can be retrieved via event.detail
. Check the console for more information<QRCode
data="https://duxreserve.com"
on:qrCodeGenerated={handleQrCodeGenerated}
on:qrCodeRegeneratedWithLogo={handleQrCodeRegeneratedWithLogo}
on:qrCodeGenerationFailed={handleQrCodeGenerationFailed}
/>
Sample URL for a John Doe user on the Acme app:
<QRCode data="otpauth://totp/ACME%20Co:[email protected]?secret=HXDMVJECJJWSRB3HWIZR4IFUGFTMXBOZ&issuer=ACME%20Co&algorithm=SHA1&digits=6&period=30" />