Technical Specification: Browser-Based JSON to Java POJO Generator

1. Overview

A performant, client-side web application designed to help Java and Android developers convert complex JSON objects into strongly-typed POJO (Plain Old Java Object) classes instantly. The tool operates entirely within the browser.

2. Feature List

• Live Parsing Engine: Real-time validation of input JSON.
• Type Inference: Automatic detection of Strings, Integers, Booleans, Doubles, and nested Objects/Arrays.
• Customizable Output: Toggles for:
  • Generate Getters & Setters.
  • Include JSON library annotations (Jackson @JsonProperty, Gson @SerializedName).
  • Enable Lombok @Data annotation.
  • Generate toString(), equals(), and hashCode() methods.
• Builder Pattern: Toggle to generate a fluent Builder class for the POJO.
• One-Click Copy: Dedicated button to copy the generated Java code to the system clipboard.
• Format Toggle: Ability to beautify or minify the input JSON.

3. UI Layout

• Header: Title ("JSON to Java POJO Generator") with a clean, subtitle description.
• Settings Bar: A horizontal strip with toggles (checkboxes/switches) for generated code style (Lombok, Jackson, Getters/Setters).
• Main Working Area: A responsive split-pane design:
  • Left Pane (Input): A large, monospaced textarea for raw JSON input.
  • Right Pane (Output): A read-only monospaced code block area for the generated Java code with syntax highlighting.
• Actions: A "Generate" button (if not auto-generating) and a "Copy to Clipboard" button positioned prominently.

4. Visual Design & Aesthetics

• Palette: High-contrast light mode. Primary action color: #2563eb (Professional Blue). Background: #ffffff. Text: #1f2937 (Slate Gray). Borders: #e5e7eb (Light Gray).
• Typography: Inter or system-default sans-serif for UI; JetBrains Mono or Fira Code for code blocks.
• Transitions: Micro-interactions (e.g., button scaling on hover, soft fading of text when code is updated).
• Feedback: Success state animation when code is copied (the "Copy" icon turns to a green checkmark momentarily).

5. Technical Constraints & Directives

• Sandbox Compatibility: Do NOT use localStorage, sessionStorage, or Cookies. All state (input text, settings) must be maintained in memory variables.
• Performance: Ensure all JSON parsing logic is debounced (e.g., 300ms delay) to prevent UI lag on large JSON inputs.
• Styling: Use a single CSS block for all styles, ensuring mobile responsiveness via CSS Flexbox/Grid.
• No External Frameworks: Pure Vanilla JavaScript only. Use CDN links for necessary syntax highlighting libraries (e.g., PrismJS) if needed, otherwise keep it lightweight.
• External Links: All links must include target="_blank" and rel="noopener noreferrer".