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🔧FormatKit

JSON Viewer

Explore and visualize nested JSON structures with interactive tree navigation

📁
Click to browse or drag and drop your file here
Supported formats: .json,.txt
Maximum file size: 10MB
Characters: 0

Enter valid JSON to view tree structure

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About this Tool

JSON Viewer is a free, privacy-first tool built for developers. Explore and visualize nested JSON structures with interactive tree navigation

✓100% Client-Side: All processing happens in your browser. No data is ever sent to our servers.

✓Fast & Efficient: Instant results with no server roundtrips or delays.

✓Free Forever: No sign-up, no limits, no hidden fees. Use as much as you need.

✓File Support: Upload files directly or paste content. Your choice.

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Disclaimer

This tool is provided for informational and educational purposes only. All processing happens entirely in your browser - no data is sent to our servers. While we strive for accuracy, please verify critical data before use in production environments. FormatKit is not responsible for any data loss, corruption, or issues resulting from tool usage.

How to Use JSON Viewer

Upload a JSON file or paste your JSON into the input field, and the tool will display it as an interactive tree structure. Click the arrow icons to expand or collapse nested objects and arrays. Use the search box to find specific keys, and hover over nodes to copy their values.

Key Features

  • Interactive tree navigation - Click to expand/collapse nested structures
  • Real-time validation - Instant feedback on JSON syntax errors
  • Color-coded data types - Strings (green), numbers (blue), booleans (purple), null (gray)
  • Search functionality - Quickly find specific keys in large JSON files
  • Copy node values - Click to copy any value to clipboard
  • Expand/Collapse all - Quickly navigate deep JSON hierarchies
  • Privacy-first - All processing happens in your browser, no data sent to servers

Data Type Color Coding

  • Strings - Displayed in green with quotes
  • Numbers - Displayed in blue
  • Booleans - Displayed in purple (true/false)
  • Null values - Displayed in gray
  • Objects - Show key count (e.g., "Object {3 keys}")
  • Arrays - Show item count (e.g., "Array [5 items]")

Common Use Cases

  • Exploring API responses: Visualize complex nested API data returned from REST endpoints
  • Understanding configuration files: Navigate deep JSON config files with ease
  • Debugging JSON structure: Identify missing keys or incorrect nesting in large JSON objects
  • Analyzing large datasets: Explore JSON data files without getting lost in nested structures
  • Learning JSON: Understand JSON hierarchy and relationships visually
  • Code review: Verify JSON structure before committing to version control

Why Use a Tree Viewer?

While raw JSON text is great for machines, it's hard for humans to parse, especially when dealing with deeply nested structures. A tree viewer provides:

  • Visual hierarchy: See parent-child relationships at a glance with indentation
  • Selective expansion: Focus on relevant data by expanding only what you need
  • Faster navigation: Jump to specific keys with search instead of scrolling through text
  • Better understanding: Grasp complex JSON structure without counting brackets
  • Reduced errors: Catch structural issues that are hard to spot in raw text

Keyboard Navigation

Navigate the JSON tree efficiently with your keyboard:

  • Tab: Move between interactive elements
  • Enter/Space: Expand or collapse nodes
  • Search box: Type to filter and highlight matching keys

Tips for Large JSON Files

  • Use "Collapse All" to get an overview of top-level structure
  • Search for specific keys to navigate directly to relevant data
  • Copy individual node values instead of the entire JSON
  • Expand only the branches you need to inspect

FAQ

Q: Is my JSON data secure?

Yes! All JSON parsing and visualization happens entirely in your browser. Your data never leaves your device, and nothing is sent to our servers. This is a completely client-side tool.

Q: What's the maximum file size I can view?

The tool can handle JSON files up to several megabytes. For optimal performance with very large files (100KB+), the tree will initially render with some nodes collapsed. You can expand them as needed.

Q: Can I search within the JSON?

Yes! Use the search box above the tree to filter and highlight keys. The search is case-insensitive and will highlight all matching keys in the tree.

Q: How do I copy specific values?

Hover over any node in the tree, and a copy button (📋) will appear. Click it to copy that value to your clipboard. For primitive values, the raw value is copied. For objects and arrays, the formatted JSON is copied.

Q: Can I edit the JSON in the tree view?

This tool is read-only for viewing and exploring JSON. To edit JSON, use our JSON Formatter tool instead.

Q: Does this work offline?

Once the page is loaded, yes! All processing happens in your browser, so you can use this tool without an internet connection after the initial page load.

Related Tools

Enhance your JSON workflow with these related tools: