low-code-react-app-b/PRD.md

JSON-Driven UI Architecture Enhancement

Build a comprehensive JSON-driven UI system that allows building entire user interfaces from declarative JSON schemas, breaking down complex components into atomic pieces, and extracting reusable logic into custom hooks for maximum maintainability and rapid development.

Experience Qualities:

1. Modular - Every component under 150 LOC, highly composable and reusable
2. Declarative - Define UIs through configuration rather than imperative code
3. Maintainable - Clear separation of concerns between data, logic, and presentation

Complexity Level: Complex Application (advanced functionality with multiple views)

This is an advanced system that interprets JSON schemas, manages state across multiple data sources, executes actions dynamically, and renders complex component hierarchies - requiring sophisticated architecture with component registries, action executors, and data source managers.

Essential Features

JSON Schema Parser

• Functionality: Parse and validate JSON UI schemas with full TypeScript type safety
• Purpose: Enable building UIs from configuration rather than code
• Trigger: User loads a page defined by JSON schema
• Progression: Load schema → Validate structure → Initialize data sources → Render component tree → Bind events
• Success criteria: Schemas render correctly with all data bindings and event handlers working

Data Source Management

• Functionality: Manage multiple data sources (KV store, computed values, static data) with automatic dependency tracking
• Purpose: Centralize data management and enable reactive updates
• Trigger: Component needs data or data changes
• Progression: Request data → Check source type → Load/compute value → Update dependents → Re-render
• Success criteria: Data flows correctly between sources, components, and persistence layer

Action Executor

• Functionality: Execute user actions declaratively (CRUD, navigation, toasts, custom actions)
• Purpose: Handle all user interactions declaratively without component-specific code
• Trigger: User interaction (click, change, submit, etc.)
• Progression: Parse action → Validate params → Execute handler → Update data → Show feedback
• Success criteria: All action types work correctly with proper error handling

Atomic Component Library

• Functionality: Library of small, focused, reusable components (atoms, molecules, organisms)
• Purpose: Build complex UIs from simple, tested building blocks
• Trigger: Developer needs a UI element
• Progression: Select component → Configure props → Compose with other components → Render
• Success criteria: No component exceeds 150 LOC, all components highly reusable

Custom Hooks Library

• Functionality: Extracted business logic in reusable hooks (useCRUD, useSearch, useFilter, useForm, etc.)
• Purpose: Separate concerns and enable logic reuse across components
• Trigger: Component needs common functionality (data management, search, form handling)
• Progression: Call hook → Provide config → Receive state and handlers → Render UI
• Success criteria: Hooks are testable, reusable, and follow React best practices

Edge Case Handling

• Invalid Schemas - Validate JSON structure, show helpful error messages, provide fallback UI
• Missing Components - Log warnings, render fallback div, continue rendering other components
• Data Source Errors - Catch KV failures, show toast notifications, maintain app stability
• Circular Dependencies - Detect loops in computed data sources, break cycles, warn developer
• Concurrent Updates - Use optimistic updates with rollback on failure
• Empty States - Show helpful messages and actions when no data exists

Design Direction

A dark cyberpunk development theme with electric accents and technical precision that feels like a high-powered code editor with visual design tools integrated.

Color Selection

Convey technical sophistication with electric highlights against deep, professional backgrounds.

• Primary Color: Deep Purple oklch(0.45 0.15 270) - Commands attention for primary actions, evokes advanced technology
• Secondary Colors:
  • Dark Slate oklch(0.35 0.02 250) for secondary surfaces
  • Deep Navy oklch(0.18 0.02 250) for cards and elevated surfaces
• Accent Color: Cyan Glow oklch(0.70 0.15 200) - Electric highlight for CTAs, active states, and focus indicators
• Foreground/Background Pairings:
  • Background (Deep Navy #1E1E2E) → Foreground (Light Gray #E8E8EC) - Ratio 12.5:1 ✓
  • Card (Darker Navy #252535) → Card Foreground (Light Gray #E8E8EC) - Ratio 11.2:1 ✓
  • Primary (Deep Purple #7C3AED) → Primary Foreground (White #FFFFFF) - Ratio 6.8:1 ✓
  • Accent (Cyan #5DD5F5) → Accent Foreground (Deep Navy #1E1E2E) - Ratio 9.2:1 ✓
  • Muted (Slate #38384A) → Muted Foreground (Mid Gray #A8A8B0) - Ratio 5.2:1 ✓

Font Selection

Convey technical precision and modern development with a mix of geometric sans-serif and monospace fonts.

• Typographic Hierarchy:
  • H1 (Page Titles): Space Grotesk Bold/32px/tight (-0.02em) - Geometric, technical, commanding
  • H2 (Section Headers): Space Grotesk Semi-Bold/24px/tight (-0.01em)
  • H3 (Component Headers): Space Grotesk Medium/18px/normal
  • Body Text: Inter Regular/14px/relaxed (1.6) - Highly readable, neutral, professional
  • Code/Technical: JetBrains Mono Regular/13px/normal (1.5) - Monospace for code and technical content
  • Captions/Labels: Inter Medium/12px/normal - Slightly bolder for hierarchy

Animations

Animations should feel snappy and purposeful - fast micro-interactions (100-150ms) for buttons and inputs, smooth transitions (250-300ms) for page changes and dialogs, with spring physics for natural movement. Use subtle scale transforms (0.98→1.0) on button press, slide-in animations for modals, and fade effects for state changes. Avoid unnecessary flourishes - every animation serves feedback or orientation.

Component Selection

• Components:

  • Card, Button, Input, Select, Checkbox, Switch for core UI
  • Dialog, Tabs, Badge, Progress, Separator for layout and feedback
  • Heading, Text, List, Grid for typography and layout primitives
  • ScrollArea for contained scrollable regions
  • Tooltip for contextual help

• Customizations:

  • StatusBadge - Status indicator with predefined styles
  • DataCard - Stat card with icon, trend, and loading states
  • SearchInput - Input with search icon and clear button
  • ActionBar - Title with action buttons
  • All new atomic components follow the 150 LOC limit

• States:

  • Buttons: subtle scale on press, glow effect on hover, disabled with opacity
  • Inputs: border color shift on focus, inline validation icons, smooth error states
  • Cards: subtle lift shadow on hover for interactive cards

• Icon Selection:

  • Phosphor Icons throughout
  • Code, Database, Tree, Cube for feature areas
  • Plus, Pencil, Trash for CRUD operations
  • MagnifyingGlass, Gear, Download for utilities

• Spacing:

  • Container padding: p-6 (1.5rem)
  • Section gaps: gap-6 (1.5rem)
  • Card gaps: gap-4 (1rem)
  • Button groups: gap-2 (0.5rem)
  • Tight elements: gap-1 (0.25rem)

• Mobile:

  • Stack layouts vertically on <768px
  • Reduce padding to p-4 on mobile
  • Touch-friendly tap targets (min 44px)
  • Responsive grid columns (1 → 2 → 3 → 4)
  • Bottom sheet dialogs on small screens