JSON Viewer

View, format, and validate JSON data with an interactive tree view. Collapse, expand, and analyze JSON structures.

JSON Viewer

JSON Viewer

View, format, and validate JSON data with an interactive tree view

Input JSON

Tree View

✓ Valid JSON
Size: 0 bytes Max Depth: 0 Items: 0

How It Works

1

Input JSON

Paste your JSON data directly into the input field or upload a .json file from your computer.

2

Auto-Format & Validate

The tool automatically formats and validates your JSON. Any syntax errors are displayed immediately.

3

Interactive Tree View

Explore your JSON with an interactive tree view. Click to expand/collapse nodes and navigate complex structures.

4

Copy or Download

Copy the formatted JSON to clipboard or download it as a .json file for use in your applications.

View, format, and validate JSON data with an interactive tree view. Collapse, expand, and analyze JSON structures.

This JSON Viewer lets you view, format, and validate JSON data with an interactive tree view. No signup required. All processing happens directly in your browser, ensuring your data remains private and secure. Copy formatted JSON to clipboard or download as a .json file. Perfect for developers, data analysts, and anyone working with JSON.

All processing happens directly in your browser, ensuring your data remains private and secure. Our tool works on all devices - desktop, tablet, and mobile.

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Frequently Asked Questions

What is JSON and why is it used?

JSON (JavaScript Object Notation) is a lightweight, text-based data format that's easy for humans to read and write, and easy for machines to parse and generate. It's commonly used for data exchange between web servers and browsers, API responses, configuration files, and data storage due to its simplicity and universal support.

How do I fix invalid JSON?

Our JSON Viewer automatically validates your input and shows specific error messages when JSON is invalid. Common issues include missing commas, trailing commas, unquoted keys, single quotes instead of double quotes, and missing brackets. The validator will point out where the problem occurs so you can fix it quickly.

Is my JSON data secure?

Yes, absolutely. Our JSON Viewer runs entirely in your browser—your data is never sent to any server. All processing happens locally on your device, making it safe to view sensitive JSON data like API keys, configuration files, or personal information.

What's the difference between format and minify?

Format (or pretty print) adds indentation and line breaks to make JSON human-readable. Minify removes all unnecessary whitespace to create the smallest possible file size. Use formatted JSON for development and debugging, and minified JSON for production to reduce bandwidth.

Can I view large JSON files?

Yes, our JSON Viewer can handle large JSON files. The tree view makes it easy to navigate complex structures by collapsing sections you're not currently viewing. For very large files, consider using a desktop editor, but our tool handles most typical JSON files well.

How do I use the tree view?

Click on the [-] or { -} icons next to objects and arrays to collapse them, hiding their contents. Click [+] or { +} to expand them and see nested data. This helps you focus on specific parts of your JSON without being overwhelmed by the entire structure at once.

About JSON Viewer

JSON Viewer is a powerful developer tool designed for viewing, formatting, and validating JSON data with an interactive tree view. JavaScript Object Notation (JSON) has become the standard format for data exchange in modern web applications, APIs, and configuration files. Our tool provides an intuitive interface that makes it easy to explore complex JSON structures without getting lost in nested data. The interactive tree view lets you click to expand or collapse nodes, helping you focus on specific parts of your data while hiding the rest. Color-coded syntax highlighting makes it easy to identify different data types: strings in orange, numbers in purple, booleans in red, and null in gray. Real-time validation checks your JSON syntax as you type, immediately highlighting any errors and showing you exactly where problems occur. Common issues like missing commas, trailing commas, unquoted keys, single quotes instead of double quotes, and mismatched brackets are caught instantly. The Format button prettifies your JSON with proper indentation for human-readable output, while Minify removes all whitespace to reduce file size for production. File upload support lets you open .json files directly from your computer to view and analyze their contents. Statistics display shows file size in bytes, maximum nesting depth, and total item count for arrays and objects. Copy the formatted JSON to clipboard with one click, or download it as a .json file with timestamp for version control and backup. Whether you're debugging API responses, analyzing configuration files, validating data schemas, or simply need to read JSON data more clearly, our JSON Viewer provides all the tools you need in one convenient interface. The tool runs entirely in your browser—your data never leaves your device, making it safe to use with sensitive information like API keys and configuration data. Perfect for web developers analyzing API responses, backend engineers debugging JSON payloads, data analysts exploring JSON datasets, QA engineers validating JSON structure, and anyone who works with JSON data regularly. Use this tool to quickly understand, validate, and format JSON data for development, debugging, and documentation purposes.

Unlike many online tools that require account creation or have hidden costs, JSON Viewer is completely free and requires no signup. Simply open the tool and start using it immediately. Your privacy is our priority - all processing happens locally in your browser, and your data is never stored on our servers.

Whether you're a professional, student, or casual user, JSON Viewer is designed to be intuitive and efficient. Our tool works seamlessly on desktop computers, tablets, and mobile devices, ensuring you can get your tasks done wherever you are.