How do I use the JSON Viewer?

Paste your JSON into the editor and the tool automatically formats and displays it. You can expand nodes, validate syntax, beautify, or minify the JSON.

Does the JSON Viewer validate JSON?

Yes, the tool checks JSON syntax and highlights errors to help you identify and fix issues.

Can I beautify and minify JSON?

Yes. You can format JSON with proper indentation for readability or compress it into a single line.

Does this tool support large JSON files?

The tool can process large JSON files. Performance depends on your browser and device capabilities.

JSON Formatter

Format, validate, minify, and beautify your JSON data with syntax highlighting

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JSON Viewer Online – Free JSON Formatter & Validator

View, format, validate, and explore JSON data instantly with our free online JSON Viewer. Beautify messy JSON, detect syntax errors, and navigate large API responses using an interactive tree view — all directly in your browser.

What Is a JSON Viewer?

A JSON Viewer is an online tool that helps you read, format, and validate JSON data in a structured and human-readable way. Raw JSON data is often difficult to understand due to nested objects, arrays, and compact formatting. Our JSON Viewer transforms unformatted or minified JSON into a clean, expandable tree structure with syntax highlighting and built-in validation. Whether you're debugging API responses, analyzing configuration files, or working with large datasets, this tool makes JSON easy to explore and understand.

Interactive Tree View

Expand and collapse nested objects and arrays to easily navigate complex JSON structures and large API responses.

Built-In JSON Validation

Automatically detect and highlight invalid JSON syntax, missing commas, incorrect brackets, and formatting errors.

Beautify & Minify JSON

Pretty print JSON for readability or minify it for compact storage and faster data transmission with one click.

Why Use This JSON Viewer?

Improve Readability Instantly

Minified or raw JSON is hard to scan. Our viewer formats it into a clean, structured layout so you can quickly understand keys, values, and nested objects.

Debug API Responses Faster

When working with REST or GraphQL APIs, quickly inspect response data, validate structure, and identify errors before they impact your application.

Work with Large & Complex JSON

Handle deeply nested JSON objects, arrays, and large datasets smoothly using the expandable tree interface.

100% Browser-Based & Secure

All processing happens directly in your browser. No data is uploaded or stored on any server, ensuring complete privacy and security.

When Should You Use a JSON Viewer?

Inspecting API Responses

Use the JSON Viewer to analyze REST or GraphQL API responses from tools like Postman, Axios, Fetch, or backend services.

Formatting JSON Files

Quickly beautify messy or minified JSON files to make them easier to read, edit, or share.

Validating JSON Before Deployment

Ensure your JSON configuration files or API payloads are properly formatted and error-free before using them in production.

Analyzing Third-Party Data

Explore unfamiliar JSON structures from third-party APIs before mapping them to models, interfaces, or database schemas.

Learning & Debugging

Perfect for students and developers who want to understand how JSON objects and arrays are structured in real-world applications.

How to Use the JSON Viewer Online

Paste or Upload Your JSON

Copy and paste your JSON data into the editor or upload a .json file directly from your device.

{"user": {"name": "Sourav", "role": "Developer"}}

The tool automatically formats your JSON into an interactive tree view with syntax highlighting and error detection.

The tool automatically generates a TypeScript interface in the right panel. It detects types, handles nested objects, and creates proper interface names.

{
  "user": {
    "name": "Sourav",
    "role": "Developer"
  }
}

Copy or Download

Copy the formatted JSON, download it as a file, or continue editing for further processing.

Pro Tips

•Use the tree view to quickly expand only the sections you need when working with large JSON files.
•Click “Beautify” to pretty print messy JSON for better readability.
•Use “Minify” to compress JSON before sending it over APIs or storing it.
•All formatting and validation happen in your browser — your data remains private and secure.

Frequently Asked Questions

Everything you need to know about JSONtoAll tools.

Is my JSON data safe and private?

Yes! All JSON viewing, formatting, and parsing happens entirely in your browser. Your data is never uploaded, stored, or sent to any server. This makes the JSON Viewer 100% safe, secure, and private—even works offline after loading the page.

Can the JSON Viewer handle large JSON files?

Absolutely. Our JSON Viewer can process large and deeply nested JSON structures. However, extremely large files (10MB+) may slow down your browser because all processing is done client-side. For best performance, use files under 5MB.

Does it support nested objects and arrays?

Yes! The viewer fully supports complex and deeply nested JSON data. You can expand and collapse objects, arrays, and sub-trees for easy navigation and understanding.

Can I format or minify JSON?

Definitely. The tool includes built-in options to beautify, format, or minify JSON with a single click. It's perfect for cleaning messy JSON or compressing data for APIs and storage.

Does the JSON Viewer detect invalid JSON?

Yes. If your JSON contains syntax errors—missing commas, extra brackets, invalid quotes—the tool highlights the issue instantly so you can fix it quickly.

Can I upload JSON files?

Yes! You can upload any .json file directly from your device. The viewer will instantly format and display it in a structured tree view.

Can I use this JSON Viewer with APIs?

Yes. Simply paste the JSON response from any REST API into the viewer to explore it. This makes it great for debugging API responses and analyzing data structures.

Do I need to install anything?

No setup or installation required! The JSON Viewer runs directly in your browser—no extensions, no downloads, no dependencies. Just open the page and paste your JSON.

Is this tool really free?

Yes! JSONToAll is completely free to use with no hidden fees, registration requirements, or usage limits. All processing happens in your browser, so we don't even store your data.

Is my data safe and private?

Absolutely! All conversion happens entirely in your browser using JavaScript. Your data never leaves your device or gets sent to our servers. You can even use this tool offline once the page loads.

Do I need to install anything?

No installation required! This is a browser-based tool that works instantly. Just visit the page, use the tool, and you're done. No downloads, no setup, no configuration needed.

Can I use this for large files?

Yes! The tool can handle large and complex data structures. However, extremely large files (10MB+) might slow down your browser since all processing happens client-side. For best performance, use files under 5MB.

Ready to View and Explore Your JSON Instantly?

Format, validate, and explore your JSON data in a beautiful tree view. Perfect for debugging APIs, reading complex data structures, and cleaning messy JSON—all directly in your browser.