Build a QR code scanner in your Bubble app using a scanner plugin that accesses the device camera, decodes QR data, and triggers workflows based on the scanned content. This tutorial covers plugin setup, camera permissions, processing decoded data, and building a check-in system with real-time validation.
Overview: Creating a QR Code Scanner in Bubble
QR codes are used for event check-ins, product lookups, and contactless interactions. This tutorial adds camera-based QR scanning to your Bubble app using a plugin, processes decoded data, and triggers actions based on scan results.
Prerequisites
- A Bubble account with an app ready to edit
- A QR scanner plugin installed (e.g., Zeroqode QR Scanner)
- A device with a camera for testing
- Basic understanding of Bubble workflows
Step-by-step guide
Install the QR scanner plugin
Install the QR scanner plugin
Go to the Plugins tab and search for QR Scanner or Barcode Scanner. Install a plugin such as the Zeroqode QR/Barcode Scanner. Review the plugin documentation for configuration options.
Expected result: The QR scanner plugin is installed and ready to use.
Add the scanner element to your page
Add the scanner element to your page
In the Design tab, click the + icon and search for the scanner plugin's visual element. Drag it onto your page at a size of about 300x300px. Place it inside a Group you can show and hide so the camera only activates when the user clicks a Scan button.
Pro tip: Hide the scanner by default and show it only when the user taps Scan to save battery and respect privacy.
Expected result: A camera preview element ready to scan QR codes.
Handle the scanned data
Handle the scanned data
When the scanner decodes a QR code, it triggers the plugin's scan detected event. Create a workflow on this event. The decoded text is available as the scanner element's value. If it contains a URL, use Open external website. If it contains an ID, search your database for the matching record and display details or update status.
Expected result: Scanned QR data triggers the appropriate workflow action.
Build a check-in system
Build a check-in system
Create a Ticket Data Type with ticket_id (text), event (text), attendee (User), checked_in (yes/no), and check_in_time (date). When a QR is scanned, search for a Ticket where ticket_id equals the scanned value. If found and not checked in, set checked_in to yes and check_in_time to now. Show success or error feedback.
Expected result: Staff can scan QR codes to check attendees into events instantly.
Add visual feedback and error handling
Add visual feedback and error handling
After each scan, display a result message: green for success, red for invalid or already-used tickets. Add sound feedback using a JavaScript audio play action. Reset the scanner after each scan so it is ready for the next ticket. Add a scan history Repeating Group below the scanner showing recent check-ins.
Expected result: Clear visual and audio feedback for each scan result with a history log.
Complete working example
1QR SCANNER — WORKFLOW SUMMARY2==============================34DATA MODEL5 Ticket: ticket_id (text), event, attendee (User),6 checked_in (yes/no), check_in_time (date)78PAGE LAYOUT9 Button: Start Scan → Show scanner group10 Scanner Group (hidden by default)11 Result Text: success/error message12 RG: Recent check-ins1314WORKFLOW: QR Scanned15 Trigger: Scanner scan detected16 Step 1: Search Ticket where ticket_id = scanned value17 Step 2 (found, not checked in):18 Make changes → checked_in = yes, check_in_time = now19 Show green success message20 Step 3 (already checked in):21 Show yellow already-used message22 Step 4 (not found):23 Show red invalid ticket message24 Step 5: Reset scanner for next scanCommon mistakes when building a QR code scanner in Bubble
Why it's a problem: Leaving the camera active when not scanning
How to avoid: Show the scanner only when actively scanning and hide it after a successful scan.
Why it's a problem: Not validating scanned data before processing
How to avoid: Always validate that scanned value matches your expected format before database operations.
Why it's a problem: Not providing feedback after scanning
How to avoid: Show clear success/error messages with color coding after every scan.
Best practices
- Hide the scanner until the user explicitly starts scanning
- Validate scanned data format before processing
- Provide clear visual and audio feedback for each scan
- Use the back camera by default for easier alignment
- Test on real mobile devices before launching
- Add a scan history log for staff reference
Still stuck?
Copy one of these prompts to get a personalized, step-by-step explanation.
I want to add a QR code scanner to my Bubble.io app for event check-ins. How do I install a scanner plugin, decode QR data, and update a Ticket record?
Add a QR scanner to my check-in page. Install a scanner plugin, add the camera element, create a workflow that searches Tickets by scanned ID and marks them checked in.
Frequently asked questions
Does QR scanning work on desktop?
It works with webcams but is optimized for mobile rear cameras.
Can I scan barcodes too?
Many QR plugins also support barcode formats. Check the plugin documentation.
How do I generate QR codes?
Use a QR generator plugin or call a QR API like goqr.me via the API Connector.
Is there a free scanner plugin?
Some free options exist but paid plugins ($5-15/month) offer better reliability.
Can RapidDev help build a QR-based system?
Yes. RapidDev builds QR systems for check-in, inventory, contactless menus, and authentication.
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