JSONVault Pro

JSON viewer & formatter with JWT decode, diff, JSONPath. Formats JSON, YAML, XML instantly. Zero tracking. Privacy-first.

JSONVault Pro — The JSON, YAML & XML viewer built for developers who care about privacy. Instantly formats and beautifies any JSON, YAML or XML page into a clean, interactive, searchable tree. No config, no signup, no tracking. Your data never leaves your machine. CORE FEATURES (FREE) - Auto-detects and formats JSON, YAML and XML on any URL - Collapsible tree view with item counts - Dark mode + Light, Sepia, High Contrast themes - Full-text search with highlight - Sort keys alphabetically - Copy JSONPath to any value - Side-by-side diff tool - DevTools panel with network request capture - Standalone viewer (paste, import file, drag & drop) - Web Worker parsing for large files (1MB+) - Context menu: "Open in JSONVault Pro" on any page - Zero tracking. Zero analytics. Zero telemetry. PRO FEATURES - JWT auto-decode: detects eyJ... tokens and shows decoded header + payload inline — no more jwt.io - Base64 auto-detect with inline decode - JSON Schema validation - JSONPath queries directly in the browser - Advanced diff: inline mode, ignore key order, ignore whitespace, type coercion - Export to YAML, XML, CSV, TypeScript - Document history (50 entries) - 21 premium themes (Dracula, Catppuccin, Nord, Monokai, Solarized, GitHub, and more) - Virtual tree rendering for files up to 500MB - Live editing with validation and minify - Collapse to Level N - Smart Values: timestamps, colors, emails, IPs, UUIDs decoded inline BUILT DIFFERENT JSONVault Pro was built after the JSON Formatter / Give Freely incident of January 2026, where the most popular JSON extension (2M+ users) injected donation popups on checkout pages without consent. This extension is the opposite: no tracking, no analytics, no telemetry, no surprises. The code runs entirely in your browser. No data is ever sent anywhere. PERMISSIONS EXPLAINED - Storage: saves your preferences locally - WebRequest: reads Content-Type headers to detect JSON/YAML/XML (read-only, never modifies requests) - Scripting: injects the viewer only when a structured format is confirmed - All URLs: JSON/YAML/XML can come from any domain — the extension needs to work everywhere Questions or bugs? https://github.com/valentinconan/jsonvault-pro-site/issues Website: https://jsonvaultpro.com