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QR Code Scanner Pro - Product Requirements Document (PRD)

Document Version: 1.0 Last Updated: 24th April 2025 Owner: Chirag Singhal Status: final Prepared for: AI Code Assistant

1. Introduction & Overview

  • 1.1. Purpose: This document outlines the requirements for "QR Code Scanner Pro," a mobile application for iOS and Android built using React Native (Expo). Its primary function is to provide users with a fast, reliable, and user-friendly way to scan QR codes and interact with the encoded data. This PRD serves as a blueprint for development, specifically intended for use by an AI code assistant.
  • 1.2. Problem Statement: Users need a dedicated, efficient, and feature-rich application to scan various types of QR codes encountered in daily life (URLs, contact info, Wi-Fi credentials, text, etc.) and take appropriate actions based on the content, potentially managing a history of their scans. While built-in camera apps offer basic scanning, a dedicated app can provide enhanced features, better data handling, history management, and a focused user experience.
  • 1.3. Vision / High-Level Solution: To create a best-in-class, production-ready QR code scanning application using modern React Native tools and practices. The app will offer seamless scanning, intelligent data parsing, actionable options, user authentication for potential future cloud features (like sync), and a persistent scan history, all wrapped in a clean and performant user interface.

2. Goals & Objectives

  • 2.1. Business Goals:
    • Deliver a fully functional, high-quality QR scanning utility app.
    • Establish a foundation for potential future feature expansion (e.g., code generation, advanced history management).
  • 2.2. Product Goals:
    • Provide fast and accurate QR code scanning.
    • Automatically detect and parse common QR code data types.
    • Offer contextually relevant actions for scanned data.
    • Allow users to view and manage their scan history.
    • Ensure a smooth, intuitive, and visually appealing user experience on both iOS and Android.
    • Implement user authentication using Clerk for potential future features and basic user management.
  • 2.3. Success Metrics (KPIs):
    • Scan Success Rate (>98%).
    • Average time from app open to successful scan (< 3 seconds).
    • User retention rate (Monthly Active Users).
    • Crash-free sessions rate (>99.5%).
    • Positive App Store ratings (Target > 4.5 stars).

3. Scope

  • 3.1. In Scope:
    • Development of a React Native (Expo) application using TypeScript.
    • Real-time camera preview for scanning.
    • QR code detection and decoding using react-native-vision-camera.
    • Parsing of common data types: URL, Text, vCard/MeCard (Contact), Wi-Fi Credentials, SMS, Email, Geo-location.
    • Displaying scanned data clearly to the user.
    • Providing context-aware actions (e.g., "Open URL", "Add Contact", "Connect to Wi-Fi", "Copy Text").
    • Persistent local storage of scan history (timestamp, data type, preview/content) using react-native-mmkv.
    • User authentication (Sign Up, Sign In, Sign Out) using Clerk. (Note: Initially, login might gate access to history or future sync features, TBD based on final flow).
    • Basic settings screen (e.g., toggle sound/vibration on scan).
    • Clean, intuitive UI styled with NativeWind.
    • Basic animations/transitions using react-native-reanimated for a smoother feel.
    • Implementation within the specified frontend/ folder structure.
    • Comprehensive error handling and reporting using Sentry / Bugsnag.
    • Unit and integration testing using React Native Testing Library.
    • End-to-end UI testing using Maestro.
    • Use of Expo Router for navigation.
    • Use of Expo Image for any image display needs (e.g., icons).
    • Potential use of Zego for context menus (e.g., on history items).
    • Use of react-native-gesture-handler (likely included with dependencies).
  • 3.2. Out of Scope:
    • Scanning of other barcode types (e.g., EAN, UPC, Code 128).
    • Generating QR codes.
    • Cloud synchronization of scan history (unless explicitly added later).
    • Advanced history features (e.g., bulk actions, complex filtering/searching beyond simple text match, folders/tags).
    • Backend API development beyond Clerk integration.
    • In-app purchases or monetization features.
    • Web or Desktop versions.

4. User Personas & Scenarios

  • 4.1. Primary Persona(s):
    • Everyday User (Tech-Savvy): Alex, 30. Uses smartphone apps daily. Encounters QR codes on posters, products, websites, and for Wi-Fi access. Wants a quick, reliable scanner that remembers past scans and makes it easy to act on the information. May appreciate features like history. Values privacy and a clean interface.
  • 4.2. Key User Scenarios / Use Cases:
    • Scan & Go: Alex opens the app, points it at a QR code on a poster, the app instantly recognizes it as a URL, displays it, and Alex taps "Open URL" to visit the website.
    • Add Contact: Alex scans a QR code on a business card (vCard), the app recognizes the contact details, displays them, and Alex taps "Add Contact" to save it to their phone's address book.
    • Connect to Wi-Fi: Alex scans a QR code provided by a cafe, the app recognizes the Wi-Fi network details (SSID, password, security type), and Alex taps "Connect to Wi-Fi" to join the network.
    • Recall Past Scan: Alex remembers scanning a product QR code last week. They open the app, go to the History screen, scroll or search, find the relevant entry, and view the details or re-trigger the action.
    • Manage Account: Alex signs up for an account using their Google profile via Clerk to potentially back up their history in the future (even if sync isn't in v1, auth is).

5. User Stories

  • US1: As a user, I want to open the app and immediately see a camera view ready to scan, so I can scan QR codes quickly.
  • US2: As a user, I want the app to automatically detect and decode QR codes presented to the camera, so I don't have to manually trigger the scan.
  • US3: As a user, I want the app to display the content of the scanned QR code clearly, so I know what information it contains.
  • US4: As a user, I want the app to identify the type of data in the QR code (URL, Contact, Wi-Fi, etc.) and offer relevant action buttons, so I can easily interact with the data.
  • US5: As a user, I want the app to save a history of my scanned codes locally, so I can refer back to them later.
  • US6: As a user, I want to be able to view my scan history in a list format, showing key details like date/time and content snippet.
  • US7: As a user, I want to be able to tap on a history item to view its full details and potentially re-trigger the associated action.
  • US8: As a user, I want to be able to copy the raw text content of any scanned QR code to my clipboard.
  • US9: As a user, I want to be able to sign up and log in using my email or social providers (via Clerk), so my identity is managed for potential future features.
  • US10: As a user, I want basic feedback (e.g., sound, vibration) upon a successful scan, configurable in settings.
  • US11: As a user, I want the app interface to be clean, responsive, and easy to navigate using standard mobile patterns (e.g., bottom tabs via Expo Router).

6. Functional Requirements (FR)

  • 6.1. Core Scanning & Decoding
    • FR1.1: The app MUST display a live camera feed upon launch or navigating to the primary scan screen.
    • FR1.2: The app MUST utilize react-native-vision-camera to continuously detect QR codes within the camera view.
    • FR1.3: Upon successful detection, the app MUST decode the QR code data.
    • FR1.4: The app MUST provide visual feedback during scanning (e.g., highlighting the detected QR code).
    • FR1.5: The app MUST provide configurable auditory/haptic feedback upon successful scan.
  • 6.2. Data Handling & Actions
    • FR2.1: The app MUST parse the decoded data to identify its type (URL, Text, vCard, MeCard, Wi-Fi, SMS, Email, Geo-location).
    • FR2.2: The app MUST display the parsed data or a relevant summary to the user.
    • FR2.3: The app MUST present context-specific action buttons based on the data type:
      • URL: Open in browser, Copy URL.
      • Text: Copy Text, Share Text.
      • vCard/MeCard: Add to Contacts, Show Details, Copy Raw Data.
      • Wi-Fi: Connect to Network (using native APIs), Copy Password, Copy SSID.
      • SMS: Send SMS (pre-fill number/message), Copy Number, Copy Message.
      • Email: Send Email (pre-fill recipient/subject/body), Copy Address.
      • Geo-location: Open in Maps App, Copy Coordinates.
    • FR2.4: The app MUST allow copying the raw decoded data to the clipboard regardless of type.
  • 6.3. Scan History
    • FR3.1: The app MUST store each successful scan event locally using react-native-mmkv.
    • FR3.2: Stored history MUST include: timestamp, data type, decoded content/summary.
    • FR3.3: The app MUST provide a dedicated screen to display the scan history, sorted chronologically (newest first).
    • FR3.4: Users MUST be able to tap a history item to view its full details and access relevant actions again.
    • FR3.5: Users MUST be able to delete individual history items.
    • FR3.6: Users MUST be able to clear the entire scan history.
  • 6.4. User Authentication (Clerk)
    • FR4.1: The app MUST integrate Clerk for user authentication.
    • FR4.2: Users MUST be able to Sign Up using Email/Password and supported Social Providers (e.g., Google, Apple).
    • FR4.3: Users MUST be able to Sign In using previously registered credentials.
    • FR4.4: Users MUST be able to Sign Out.
    • FR4.5: Authentication state MUST be managed consistently throughout the app. (Note: Define which features strictly require login - e.g., accessing history might be gated).
  • 6.5. Settings
    • FR5.1: The app MUST provide a settings screen.
    • FR5.2: Users MUST be able to toggle scan feedback (sound, vibration) on/off.
    • FR5.3: The settings screen SHOULD provide access to user account management (Sign Out, potentially Delete Account via Clerk).

7. Non-Functional Requirements (NFR)

  • 7.1. Performance:
    • NFR1.1: QR code detection and decoding should appear near instantaneous (< 500ms from stable view).
    • NFR1.2: App launch time should be minimized (< 2 seconds cold start).
    • NFR1.3: UI transitions and animations should be smooth (60 FPS).
    • NFR1.4: Battery consumption during active scanning should be optimized. react-native-vision-camera parameters might need tuning.
  • 7.2. Scalability:
    • NFR2.1: The local history storage (react-native-mmkv) should handle thousands of entries without significant performance degradation in loading or querying.
    • NFR2.2: The architecture (Expo Router, components) should allow for adding new features (like code generation or different barcode types) in the future without major refactoring.
  • 7.3. Usability:
    • NFR3.1: The app must be intuitive, requiring minimal instruction for core functionality.
    • NFR3.2: Navigation must be clear and consistent, using Expo Router and potentially native bottom tabs.
    • NFR3.3: Touch targets must adhere to platform guidelines.
    • NFR3.4: Feedback must be provided for user actions (taps, successful scans, errors).
  • 7.4. Reliability / Availability:
    • NFR4.1: The app should function correctly offline for core scanning and local history access.
    • NFR4.2: The app must handle camera permission requests gracefully.
    • NFR4.3: The app must be resilient to common errors (e.g., network issues during auth, malformed QR data).
    • NFR4.4: Crash-free session rate target: >99.5% (monitored via Sentry/Bugsnag).
  • 7.5. Security:
    • NFR5.1: User authentication credentials must be handled securely via Clerk integration. No sensitive auth data stored locally.
    • NFR5.2: Permissions (Camera, Contacts, Wi-Fi State) must be requested only when necessary and explained clearly.
    • NFR5.3: Input validation should be applied, especially if interacting with external systems based on QR data.
    • NFR5.4: If handling sensitive data via QR codes, ensure it's not logged or exposed inappropriately.
  • 7.6. Accessibility:
    • NFR6.1: The app should adhere to basic accessibility guidelines (e.g., sufficient color contrast, support for dynamic font sizes, accessible labels for controls). Consider testing with screen readers.
  • 7.7. Maintainability:
    • NFR7.1: Code MUST be written in TypeScript with strict typing.
    • NFR7.2: Code MUST follow standard React Native/Expo best practices and a consistent coding style (e.g., use ESLint/Prettier).
    • NFR7.3: Code MUST be well-documented, especially complex logic or component props.
    • NFR7.4: The project structure MUST follow the frontend/ convention.
    • NFR7.5: Dependencies MUST be kept up-to-date.

8. UI/UX Requirements & Design

  • 8.1. Wireframes / Mockups: (To be provided or developed based on discussion). Initial concept:
    • Scan Screen: Full-screen camera view with a clear viewfinder area. Minimal controls visible (perhaps flash toggle). Scanned data overlay appears upon detection.
    • History Screen: List view of past scans (icon/type, content preview, timestamp). Search bar at the top. Clear/Delete options.
    • Settings Screen: Simple list of options (Feedback toggles, Account management).
    • Navigation: Likely bottom tab navigation (Expo Router with native tabs) for Scan, History, Settings.
  • 8.2. Key UI Elements:
    • Use NativeWind for all styling, ensuring consistency.
    • Clear typography and iconography.
    • Loading indicators for asynchronous actions (e.g., signing in).
    • Error messages displayed non-intrusively.
    • Use Expo Image for optimized image loading.
    • Consider Zego for context menus on history items (e.g., Copy, Delete, Share).
  • 8.3. User Flow Diagrams: (To be provided or developed). Key flows: Scan -> Action, View History -> View Detail, Sign Up/In.

9. Data Requirements

  • 9.1. Data Model (Conceptual):
    • ScanHistoryItem:
      • id: string (UUID)
      • timestamp: number (Unix ms)
      • dataType: string (e.g., 'URL', 'TEXT', 'VCARD', 'WIFI')
      • rawData: string
      • displayData: string (potentially formatted or summarized)
      • isFavorite: boolean (optional future feature)
    • AppSettings: (Stored via react-native-mmkv)
      • scanSoundEnabled: boolean
      • scanVibrationEnabled: boolean
  • 9.2. Data Migration: Not applicable for initial release.
  • 9.3. Analytics & Tracking:
    • Integrate Sentry or Bugsnag for error reporting and performance monitoring.
    • Track key events (e.g., app_open, scan_success, scan_failed, action_taken_{type}, history_viewed, user_login, user_signup) for understanding usage patterns (consider adding an analytics library if needed beyond error tracking).

10. Release Criteria

  • 10.1. Functional Criteria: All functional requirements listed in Section 6 are implemented and pass testing. All specified integrations (Clerk, Vision Camera, MMKV etc.) are working correctly.
  • 10.2. Non-Functional Criteria: Performance, Reliability, Usability, and Security NFRs (Section 7) are met. The app performs well on target iOS and Android devices/versions.
  • 10.3. Testing Criteria:
    • Unit/Integration tests (React Native Testing Library) achieve target code coverage (e.g., >80%).
    • All major user flows pass end-to-end testing (Maestro).
    • Manual testing confirms usability and handles edge cases across different devices and OS versions.
    • No blocking or critical bugs remain open.
  • 10.4. Documentation Criteria: Code is well-commented. A README.md file exists explaining setup and build process.

11. Open Issues / Future Considerations

  • 11.1. Open Issues:
    • Final decision on which features strictly require user login.
    • Detailed design mockups/wireframes need creation/confirmation.
    • Specific list of supported Social Providers for Clerk.
  • 11.2. Future Enhancements (Post-Launch):
    • QR Code Generation.
    • Support for other barcode types.
    • Cloud sync for scan history (leveraging Clerk user ID).
    • Advanced history management (search, filtering, tags, favorites).
    • Customizable actions or integrations.
    • Bulk actions on history (e.g., delete multiple).
    • Widget support (e.g., quick scan shortcut).

12. Appendix & Glossary

  • 12.1. Glossary:
    • QR Code: Quick Response code; a type of matrix barcode.
    • Expo: A framework and platform for universal React applications.
    • React Native: A framework for building native apps using React.
    • Clerk: Authentication and user management service.
    • MMKV: Efficient mobile key-value storage library.
    • NativeWind: Tailwind CSS for React Native.
    • Vision Camera: High-performance camera library for React Native.
    • Expo Router: File-based routing for React Native/Expo apps.
  • 12.2. Related Documents: (Link to design files, API docs if any)

13. Document History / Revisions

  • v1.0 ([Current Date]): Initial draft created based on user request.

Instructions for the AI Code Assistant:

  • Goal: Implement the "QR Code Scanner Pro" application as defined in this PRD. The goal is a complete, production-ready React Native application for iOS and Android.
  • Technology Stack: Strictly adhere to the specified stack:
    • Framework: Expo (latest stable SDK)
    • Language: TypeScript (with strict mode enabled)
    • Navigation: Expo Router (utilize file-based routing, consider native bottom tabs)
    • Styling: NativeWind
    • Animations: React Native Reanimated (for smooth transitions/feedback)
    • Camera/Scanning: React Native Vision Camera
    • State Management: Use React Context/Hooks or a suitable library if complexity demands (but start simple).
    • Local Storage: React Native MMKV (for settings and history)
    • Forms (if any, e.g., Settings): React Hook Form (potentially with Zod for validation)
    • Authentication: Clerk
    • Images: Expo Image
    • Menus/Overlays: Zego (if context menus are needed, e.g., on history items)
    • Gestures: React Native Gesture Handler (ensure setup if not default)
    • Testing: React Native Testing Library (unit/integration), Maestro (E2E)
    • Error Monitoring: Sentry or Bugsnag (implement one, ensure proper setup for source maps)
  • Project Structure: All application code must reside within a frontend/ directory in the root of the project repository. Follow standard Expo project structure conventions within frontend/.
  • Code Quality:
    • Produce well-documented, clean, and maintainable TypeScript code.
    • Follow React/React Native best practices (functional components, hooks).
    • Implement comprehensive error handling throughout the application.
    • Ensure the UI is responsive and adapts to different screen sizes.
    • Code MUST be error-free and pass linting/type-checking.
  • Completeness: Implement all features marked as "In Scope" (Section 3.1) and satisfy all Functional Requirements (Section 6). Do not leave features partially implemented or marked as "TODO" unless explicitly noted as future considerations. This is not an MVP; aim for the final product described.
  • Testing: Provide unit tests for key functions/components and E2E tests for critical user flows as specified.
  • Deliverable: A fully functional, tested, and documented React Native Expo application codebase within the frontend/ directory, ready for building and deployment. Include a README with setup, build, and run instructions.