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DeltaView Implementation Summary

✅ Implementation Complete

A fully functional JSON diff comparison application has been implemented based on the specifications in docs/prompt.md.

🎯 Features Implemented

Core Features

  • ✅ Two side-by-side JSON panels with Monaco Editor
  • ✅ Resizable split layout using react-resizable-panels
  • ✅ Format Left/Right buttons for JSON validation and formatting
  • ✅ Compare button to analyze structural differences
  • ✅ Clear button to reset all content
  • ✅ Real-time syntax highlighting and validation

Diff Engine

  • ✅ Structural JSON comparison (parse-first approach)
  • ✅ Recursive diff algorithm
  • ✅ Detects added, removed, and modified fields
  • ✅ Shows full JSON path for each change (e.g., user.address.city)
  • ✅ Color-coded highlights:
    • 🟢 Green for added fields
    • 🔴 Red for removed fields
    • 🟡 Yellow for modified fields

Backend API

  • ✅ POST /api/format - Validates and formats JSON
  • ✅ POST /api/diff - Compares two JSON objects
  • ✅ Proper error handling and validation
  • ✅ TypeScript-based API handlers

UX Features

  • ✅ Clean, developer-focused UI using shadcn/ui
  • ✅ Dark mode by default
  • ✅ Monospace fonts for code
  • ✅ Subtle, non-aggressive colors
  • ✅ Collapsible/expandable diff items for complex values
  • ✅ Error banner with inline error messages
  • ✅ Loading states during API calls
  • ✅ Summary statistics (count of added/removed/modified)
  • ✅ Responsive layout

📦 Components Created

  1. JsonPanel - Monaco Editor wrapper with error display
  2. ActionBar - Top toolbar with all action buttons
  3. DiffViewer - Displays structured diff results with color coding
  4. ErrorBanner - Reusable error message component
  5. DeltaView - Main app component coordinating all features

🛠️ Technical Stack

  • Frontend: React 19, TypeScript
  • UI: shadcn/ui (New York style) + Tailwind CSS
  • Code Editor: Monaco Editor (VS Code's editor)
  • Layout: react-resizable-panels
  • Backend: Bun server with API routes
  • Runtime: Bun (fast JavaScript runtime)

🚀 How to Run

  1. Install dependencies:

    bun install

  2. Start the development server:

    bun run dev

  3. Open your browser to the URL shown (typically http://localhost:3000)

💻 Usage

  1. Paste or type JSON into the left and right panels
  2. Click Format Left or Format Right to validate and format JSON
  3. Click Compare to see differences between the two JSON objects
  4. View detailed diff results with paths and values
  5. Click Clear to reset and start over

🎨 Design Principles

  • Minimal & Clean - No clutter, just the essentials
  • Developer-Focused - Monospace fonts, syntax highlighting
  • Accessible - Proper contrast, keyboard navigation
  • Performant - Fast JSON parsing and diff algorithms
  • Error-Tolerant - Clear error messages, no crashes

📁 File Structure

src/
├── components/
│   ├── ActionBar.tsx       # Top action buttons
│   ├── DiffChecker.tsx     # Main DeltaView component
│   ├── DiffViewer.tsx      # Diff results display
│   ├── ErrorBanner.tsx     # Error message component
│   ├── JsonPanel.tsx       # Monaco editor panel
│   └── ui/                 # shadcn/ui components
├── lib/
│   ├── diff.ts             # Diff algorithm & utilities
│   └── utils.ts            # Helper functions
├── frontend.tsx            # React entry point
├── index.tsx               # Bun server with API routes
├── index.html              # HTML template
└── index.css               # Global styles

🧪 API Endpoints

POST /api/format

Formats and validates JSON.

Request:

{
  "raw": "{'invalid': json}"
}

Response (Success):

{
  "formatted": "{\n  \"valid\": \"json\"\n}"
}

Response (Error):

{
  "error": "Unexpected token ' in JSON at position 1"
}

POST /api/diff

Compares two JSON objects.

Request:

{
  "left": "{\"name\": \"John\"}",
  "right": "{\"name\": \"Jane\"}"
}

Response:

{
  "changes": [
    {
      "path": "name",
      "type": "modified",
      "oldValue": "John",
      "newValue": "Jane"
    }
  ]
}

✨ Next Steps (Optional Enhancements)

  • Add JSON schema validation
  • Support for other data formats (YAML, XML)
  • Export diff results
  • Share/permalink functionality
  • Line-by-line text diff mode
  • Collapsible "unchanged sections" in diff view
  • Dark/light mode toggle

Status: ✅ Ready for use! Last Updated: 2026-02-14