JSON Formatter Offline

1s0s.com

About this app

JSON Formatter is a fast, privacy-first JSON tool that works 100% offline. Your data never leaves your device — no servers, no tracking, no internet required.

Paste messy JSON and instantly get clean, formatted output with syntax highlighting. Validate JSON with clear error messages pointing to exact line numbers. Explore complex structures with an interactive tree viewer.

★ CORE FEATURES
• Format & Prettify — Transform compact JSON into readable, indented output
• Validate — Instant validation with precise error location
• Minify — Compress JSON by removing all whitespace
• Syntax Highlighting — Color-coded keys, strings, numbers, booleans, and nulls
• Adjustable Indentation — 2 spaces, 4 spaces, or tabs

★ ADVANCED TOOLS
• Tree Viewer — Collapsible tree view of your JSON structure
• JSON Path Finder — Click any value to get its JSONPath
• JSON Diff — Compare two JSON objects side by side
• Search & Filter — Find keys or values within large JSON
• JSON ↔ CSV Converter — Convert flat JSON arrays to CSV and back
• File Upload — Open .json files directly from your device
• History — Recent JSON pastes saved locally

★ STATS & INSIGHTS
• Key count, nesting depth, and size in bytes
• Structure overview at a glance

★ PRIVACY & SECURITY
• 100% Offline — Zero network requests, ever
• No data collection — Nothing is sent anywhere
• No ads, no tracking, no analytics
• Works without internet connection

Built for developers, DevOps engineers, QA testers, and anyone who works with JSON data. Dark mode interface with monospace fonts for comfortable code reading.

Perfect for working with API responses, config files, database exports, and any JSON data you need to inspect quickly and privately.

What’s new

Updated app icon and minor improvements.