JSON Beautifier and Formatter Specification

Overview

A high-performance, client-side web application designed to parse, validate, and format minified JSON strings into a human-readable, indented structure.

Layout Structure

• Header: Contains the application title and a theme toggle (Light/Dark mode).
• Main Interface: A split-screen layout.
  • Left Panel (Input): A large, monospaced textarea with line numbering for entering raw JSON.
  • Right Panel (Output): A display-only pre-formatted code block area for viewing the beautified output.
• Control Bar: Fixed between or below the panels containing primary action buttons: 'Beautify', 'Validate', 'Copy to Clipboard', and 'Clear'.

Visual Design and Colors

• Color Palette: Professional grayscale palette. Surface background #F9FAFB, text #111827, border #D1D5DB. Primary action button uses #2563EB (blue).
• Animations: Subtle fade-in transition when the formatted output replaces the previous content. Smooth collapse/expand animations if adding a collapsible JSON tree viewer.

Interactive Features

1. One-Click Beautify: Instantly formats minified or poorly spaced JSON.
2. Real-Time Validation: Displays an inline notification if JSON syntax is invalid, pinpointing the line number of the error.
3. Syntax Highlighting: Uses color-coding (tokens) in the output area to distinguish keys, strings, numbers, and booleans.
4. Copy to Clipboard: One-tap button to copy the formatted output to the system clipboard.
5. Responsive Design: Auto-stacks panels vertically on mobile devices for optimized screen real estate usage.
6. Indentation Control: A dropdown menu to allow users to toggle between 2-space, 4-space, or tab indentation preferences.