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Planning Guide

An educational web application that demonstrates REST API communication between frontend and backend, showing HTTP methods (GET, POST, PUT, DELETE) with real-time request/response visualization.

Experience Qualities:

  1. Educational - Clear visual feedback showing exactly what happens during each API call
  2. Interactive - Hands-on exploration of different HTTP methods and their effects
  3. Transparent - All request details and responses are visible to understand the complete flow

Complexity Level: Light Application (multiple features with basic state)

  • Multiple CRUD operations with visual feedback and request/response inspection panels

Essential Features

User Management CRUD

  • Functionality: Create, read, update, and delete user records
  • Purpose: Demonstrate all four main REST API operations with a familiar data model
  • Trigger: Buttons for each operation (Add User, Edit, Delete)
  • Progression: Click action → Show request details → Execute API call → Display response → Update UI
  • Success criteria: Users can see the HTTP method, endpoint, headers, body, and response for each operation

Request Inspector

  • Functionality: Display detailed information about each API request before it's sent
  • Purpose: Show what data is actually being sent to the backend
  • Trigger: Automatically appears when user initiates any API action
  • Progression: Action triggered → Request panel shows method/URL/headers/body → User confirms → Response displayed
  • Success criteria: Clear visualization of HTTP method, endpoint URL, request headers, and JSON body

Response Viewer

  • Functionality: Show the backend response including status code, headers, and response body
  • Purpose: Demonstrate what the backend returns and how to interpret it
  • Trigger: Automatically appears after API call completes
  • Progression: API call completes → Response panel shows status/headers/body → UI updates based on response
  • Success criteria: Status codes are color-coded (2xx green, 4xx yellow, 5xx red), response JSON is formatted

API Method Examples

  • Functionality: Pre-built examples for each REST method (GET, POST, PUT, DELETE)
  • Purpose: Provide ready-to-use examples that users can execute immediately
  • Trigger: Click on example cards or method tabs
  • Progression: Select example → Request pre-fills → Execute → See response → Learn pattern
  • Success criteria: Each HTTP method has at least one clear example with explanatory text

Edge Case Handling

  • Network Errors: Show friendly error messages when simulated API calls fail
  • Empty State: Display helpful instructions when no users exist yet
  • Loading States: Show loading indicators during API calls
  • Invalid Input: Validate form fields and show inline error messages

Design Direction

The design should feel educational and approachable, like a coding tutorial come to life - clear typography, generous spacing, and visual distinction between request and response sections to reinforce the client-server mental model.

Color Selection

Complementary (opposite colors) - Using blue for requests and green for successful responses creates clear visual distinction between client actions and server responses, with orange accents for important interactions.

  • Primary Color: Deep Blue oklch(0.45 0.15 250) - Represents client/request side, trustworthy and technical
  • Secondary Colors: Sage Green oklch(0.55 0.12 150) for success responses, creating visual separation from requests
  • Accent Color: Vibrant Orange oklch(0.65 0.18 40) for interactive elements and call-to-action buttons
  • Foreground/Background Pairings:
    • Background (Light Gray oklch(0.98 0 0)): Dark text oklch(0.2 0 0) - Ratio 14:1 ✓
    • Card (White oklch(1 0 0)): Dark text oklch(0.2 0 0) - Ratio 16:1 ✓
    • Primary (Deep Blue oklch(0.45 0.15 250)): White text oklch(1 0 0) - Ratio 8.5:1 ✓
    • Secondary (Sage Green oklch(0.55 0.12 150)): White text oklch(1 0 0) - Ratio 5.2:1 ✓
    • Accent (Vibrant Orange oklch(0.65 0.18 40)): White text oklch(1 0 0) - Ratio 4.8:1 ✓
    • Muted (Light Gray oklch(0.95 0 0)): Medium text oklch(0.45 0 0) - Ratio 6.2:1 ✓

Font Selection

Clean, modern sans-serif typefaces that feel technical but approachable - Inter for its excellent readability in code-adjacent contexts and crisp rendering at small sizes for displaying JSON data.

  • Typographic Hierarchy:
    • H1 (Page Title): Inter Bold/32px/tight letter spacing
    • H2 (Section Headers): Inter SemiBold/24px/normal spacing
    • H3 (Card Titles): Inter Medium/18px/normal spacing
    • Body (Instructions): Inter Regular/16px/relaxed line height (1.6)
    • Code (JSON/URLs): JetBrains Mono Regular/14px/monospace for technical content
    • Labels: Inter Medium/14px/slight letter spacing

Animations

Subtle and functional - animations should guide attention to the request→response flow and provide feedback for interactions, with smooth transitions that reinforce the sequential nature of API communication.

  • Purposeful Meaning: Smooth slide-ins for request/response panels emphasize the temporal sequence of API calls
  • Hierarchy of Movement: Primary focus on request→response transitions, secondary on CRUD operations updating the list

Component Selection

  • Components:

    • Card: For user list items and request/response panels with subtle shadows
    • Button: Primary (accent) for main actions, Secondary for cancel/reset, Destructive for delete
    • Dialog: For add/edit user forms with clear call-to-action
    • Badge: For HTTP method labels (GET/POST/PUT/DELETE) with color coding
    • Separator: To divide request and response sections visually
    • ScrollArea: For displaying long JSON responses
    • Input & Label: For form fields with clear focus states
    • Tabs: For switching between different API method examples

  • Customizations:

    • Syntax-highlighted JSON viewer component for request/response bodies
    • HTTP status code badge with color coding (2xx green, 4xx yellow, 5xx red)
    • Split panel layout showing request on left, response on right

  • States:

    • Buttons: Distinct hover with slight scale, active with pressed effect, loading with spinner
    • Inputs: Clear focus ring in accent color, error state in destructive red
    • Cards: Subtle hover elevation for interactive items

  • Icon Selection:

    • Plus for add user
    • PencilSimple for edit
    • Trash for delete
    • ArrowRight for send request
    • Check for success
    • Warning for errors
    • Code for JSON viewer

  • Spacing:

    • Container padding: p-6 to p-8
    • Card gaps: gap-4 for tight groups, gap-6 for sections
    • Form fields: space-y-4
    • Section separation: mb-8 to mb-12

  • Mobile:

    • Stack request/response panels vertically on small screens
    • Full-width buttons on mobile
    • Collapsible sections for request details
    • Touch-friendly button sizing (min 44px height)