JSON Viewer

A modern, fast JSON formatter and viewer with interactive tree view, search functionality, and clean design.

Features

Interactive Tree View

Explore JSON data with expandable nodes, type-specific icons, and keyboard navigation. Features 0-based indexing and smart expansion controls.

Advanced Search

Search through JSON keys and values with highlighting, result navigation (Ctrl+K), and auto-expand to show matches.

High Performance

Optimized for large JSON files (5MB+) with lazy loading, efficient rendering, and responsive sidebar resizing.

Multi-View Sidebar

View selected data in three formats: sortable table with pagination, formatted JSON text, and auto-generated JSON schema.

Privacy-First

All processing happens locally in your browser. No data is sent to servers, with GDPR-friendly localStorage for UI preferences.

Code Editor

Full-featured code editor with syntax highlighting, auto-formatting, undo/redo, and customizable indentation.

URL Loading

Load JSON directly from URLs with hash routing support and automatic formatting.

Modern UI

Clean, professional interface with responsive design, touch-friendly controls, and consistent visual hierarchy.

Developer Tools

JSON schema generation, keyboard shortcuts, customizable indentation, drag-and-drop file support, and copy/paste functionality.

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How to Use

Input JSON

Use the Text tab to paste JSON data, upload files via drag-and-drop, or load from URLs using the toolbar buttons

Format & Edit

Automatically format and validate your JSON data, customize indentation levels, and make changes with undo and redo support.

Explore Structure

Switch to the Viewer tab to see the interactive tree with expandable nodes and type indicators

Search & Navigate

Use Ctrl+K to focus search, navigate results with arrow keys, and auto-expand to show matches

Analyze Data

Select nodes to view details in the sidebar's table, JSON, or schema tabs with sortable columns and pagination

Export & Share

Download JSON files with custom names, copy values to clipboard, or share via URL hash routing

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Why Choose Our JSON Viewer?

Feature-Rich

Comprehensive toolset including tree view, search, multi-format sidebar, URL loading, and developer tools

Performance Optimized

Built with Svelte for speed, handles large files (5MB+) with lazy loading and efficient rendering

Privacy-First

All processing happens locally in your browser - no data sent to servers, GDPR-compliant storage

Developer-Friendly

Advanced features like JSON schema generation, keyboard shortcuts, customizable indentation, and URL hash routing

Modern & Responsive

Clean interface that works perfectly on desktop, tablet, and mobile with touch-friendly controls

Free & Open

No registration, no limits, completely free online tool with transparent functionality

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Frequently Asked Questions

How is this different from other JSON viewers?

Is my data safe and private?

Can it handle large JSON files?

What keyboard shortcuts are available?

How do I load JSON from a URL?

What's the JSON schema feature?

Does it work on mobile devices?

Can I customize the indentation?