JSON Formatter is a lightweight macOS tool that instantly transforms messy JSON into clean, readable output — with syntax highlighting, validation, and a built-in history panel
JSON Formatter is a lightweight macOS tool that instantly transforms messy JSON into clean, readable output — with syntax highlighting, validation, and a built-in history panel.
KEY FEATURES:
• One-click JSON formatting with real-time preview
• Syntax highlighting for keys, strings, numbers, booleans, and null
• Validate JSON instantly — clear error message when input is invalid
• History panel — recent inputs saved automatically; search by keyword
• Indent with spaces or tabs (customizable width: 1–8)
• Sort object keys alphabetically (optional)
• Paste from clipboard and copy formatted result with one click
• Auto-format as you type
• Monitor clipboard for JSON — paste automatically when detected
• Japanese and English UI (follows your Mac's language setting)
PERFECT FOR:
• API developers inspecting and debugging JSON responses
• Frontend and backend engineers validating data structures
• Anyone who needs clean, readable JSON at a glance
PRIVACY:
• Fully offline — your JSON never leaves your Mac
• No data collection, no analytics, no network required
Simplify your JSON workflow with a fast, native macOS experience.