Online JSON Viewer
Paste or type your JSON below. The viewer updates automatically. Completely free — your data never leaves your browser.
About JSON Viewer
JSON Viewer is a free, browser-based tool that lets you instantly visualize, format, and explore JSON data. Whether you're a developer debugging an API response, a data analyst inspecting a dataset, or just curious about JSON — this tool makes it easy.
All processing happens entirely in your browser. No data is ever sent to any server. Your JSON stays private.
Interactive Tree View
Explore your JSON as a collapsible tree. Click any node to expand or collapse it.
Live Auto-Render
The viewer updates automatically as you type or paste.
Search & Highlight
Instantly find any key or value across your entire JSON document.
100% Private
Everything runs client-side. Your JSON data never leaves your browser.
Validation
Invalid JSON is caught immediately with a clear error message.
Smart Arrays
Primitive arrays shown inline; complex arrays shown as indexed collapsible nodes.
How to Use
- Paste your JSON into the left panel. The viewer updates automatically.
- Click ▼ / ▶ to collapse or expand any node.
- Expand all / Collapse all to control the entire tree at once.
- Search to highlight matching rows in yellow.
- Format to pretty-print your JSON with proper indentation.
- View button manually re-renders the tree.
Frequently Asked Questions
Is my JSON data safe?
Yes. All processing is done entirely in your browser. No data is ever transmitted to any server.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight, text-based data format used to exchange data between systems.
Can I use this for large JSON files?
Yes. The tool handles large JSON documents efficiently. For very large files (1MB+), you may notice a brief delay.
What browsers are supported?
JSON Viewer works in all modern browsers including Chrome, Firefox, Edge, and Safari.