JSON Viewer
Explore and navigate complex JSON structures with an interactive collapsible tree view. Search through keys and values, expand or collapse nodes, and visualize deeply nested data with ease.
No data to visualize
Enter JSON in the input above and click Visualize
What is JSON Viewer?
Some JSON files are straightforward. Others are nightmares—ten levels deep with arrays of objects containing more arrays. Trying to understand that structure by reading raw JSON is like trying to navigate a city without a map. You need a better way to explore the data.
This viewer transforms JSON into an interactive tree. Click to expand sections. Click again to collapse them. Search for specific keys or values and watch the tree highlight matches. Color coding shows you data types at a glance. It's the difference between staring at a wall of text and actually understanding your data structure.
Key Features
- Interactive Tree View: Click to expand or collapse any level of your JSON structure
- Type Annotations: See data types at a glance (string, number, boolean, object, array, null)
- Search Functionality: Instantly find keys or values anywhere in your JSON
- Color Coding: Different colors for different data types improve readability
- Expand/Collapse All: Quickly navigate large JSON structures
- Keyboard Shortcuts: Ctrl+Enter to visualize, Ctrl+K to clear
Common Use Cases
- API Response Inspection: Navigate complex responses from REST or GraphQL endpoints
- Configuration Files: Understand large config files without getting lost in nesting
- Data Debugging: Find where the structure doesn't match expectations
- Schema Understanding: Learn unfamiliar JSON structures through exploration
- Log Analysis: Dig into structured log entries that use JSON format
The search feature saves time when you know what you're looking for but not where it lives. Type a property name or value, and the tree highlights every match. Especially useful with large responses where manually expanding every node would take forever.
Frequently Asked Questions
How do I expand or collapse nodes?
Click the chevron icon next to any node. Objects and arrays can be expanded to show their contents or collapsed to hide them. Use the buttons at the top to expand or collapse everything at once—useful when you want to see the full structure or reset to just the top level.
What do the different colors mean?
Each type gets a color: strings are green, numbers are blue, booleans are purple, null values are gray, objects are yellow, and arrays are orange. After using the viewer for a while, you'll recognize types instantly without reading labels. It makes scanning large datasets much faster.
Can I search for specific values?
Yes. The search bar filters the tree view. Type any text and it matches against both keys and values. Case doesn't matter. If you search for "email", you'll see every property named email and every value containing that word. It's a quick way to locate data without manually drilling down through nested structures.
Is there a limit to how large my JSON can be?
Technically, no. Practically, browser performance varies. Files with thousands of nodes work fine. Very large files—think 10MB or more—might slow down the UI, especially on older devices. The tool processes everything in your browser, so hardware matters. If you're regularly visualizing huge files, performance depends on your machine's RAM and processor.
What happens to my data?
It stays on your device. No uploads, no backend, no external services. The visualization runs entirely in JavaScript in your browser. Once the page loads, you could disconnect from the internet and it would still work perfectly. We built it this way intentionally—your data is yours, and we never want to see it.