Online URL Query String Parser and Builder: Technical Specification

Overview

This is a client-side, browser-based web application designed to simplify the manipulation, debugging, and construction of URL query parameters. The application focuses on high performance, clean UI, and developer productivity.

UI/UX Design

• Color Palette: A professional, developer-centric palette using neutral greys, soft blues for primary actions (Add/Copy), and alert colors (red/amber) for error states. Supports both system-driven Light and Dark mode.
• Layout Structure:
  • Header: Simple, clear tool name and navigation.
  • Input Section: A dual-pane layout. Left pane for "Parser" (raw URL input). Right pane for "Builder" (interactive table).
  • Dynamic Table: A robust, editable row-based table where users can add/remove Key/Value pairs.
  • Footer: Links to privacy policy, feedback, and clear-all controls.

Core Interactive Features

1. Smart Parser:
   • Input field accepts a full URL.
   • Automatically parses the protocol, domain, and path separately from the query string.
   • Live parsing logic: Updates the parameter table instantly upon pasting.
2. Interactive Builder Table:
   • Dynamic Rows: Users can click "+" to add parameters and "x" to delete them.
   • Reordering: Drag-and-drop rows to reorder query parameters.
   • Input Validation: Highlights empty keys or duplicated keys.
3. Encoding/Decoding Controls:
   • Global toggle switches for "Auto-Encode Values" and "URL Decode Output".
   • Real-time preview of the resulting URL string below the table.
4. Copy & Clear:
   • One-click "Copy URL to Clipboard" button with a toast notification confirmation.
   • One-click "Clear All" to reset the application state.
5. Export/Import:
   • Capability to export the current parameter set as a JSON file or import a JSON object to populate the builder table.

Technical Implementation

• Responsive Design: Mobile-first approach using CSS Grid and Flexbox for seamless use on tablets and desktops.
• State Management: Simple reactive state management to handle updates between the table and the generated URL string.
• Performance: Zero external dependencies (or minimal tree-shaken libraries) to ensure sub-millisecond load times.
• Accessibility: Full keyboard navigation support (Tab key for movement, Enter to add rows, Escape to clear inputs) and ARIA labels for all interactive elements.