JSON Viewer

What is a JSON Viewer?

A JSON viewer (also called a JSON tree viewer or JSON explorer) is a tool that renders raw JSON text as a hierarchical, collapsible tree structure. Instead of reading through a wall of braces and brackets, you can visually navigate the data — expand nested objects, inspect individual values, and immediately understand the shape of any JSON document.

This tool is especially useful when debugging API responses, exploring configuration files, or working with large datasets where manually scanning the raw text is error-prone and slow.

Key Features

• Monaco editor input — the same editor used in VS Code, with full JSON syntax highlighting, bracket matching, and error markers.
• Collapsible tree view — expand and collapse any nested object or array with a single click.
• Type annotations — every value is color-coded by type (string, number, boolean, null, array, object).
• Live search — filter keys and values in real time. Non-matching branches dim automatically.
• Statistics panel — see the total key count, array count, and primitive type breakdown at a glance.
• 100% private — all processing happens locally in your browser. No data is ever uploaded.

How to Use the JSON Viewer

1. Paste your JSON into the Monaco editor on the left.
2. The tree view on the right updates instantly as you type.
3. Click any object or array node to collapse or expand it.
4. Use the search box to filter by key name or value.
5. Toggle "Collapse all / Expand all" to control the entire tree at once.
6. Click "Format" to pretty-print the raw JSON in the editor.

Common Use Cases

• API debugging — paste a response from Postman, cURL, or browser DevTools and navigate the structure visually.
• Config file inspection — explore package.json, tsconfig.json, or any app config without an IDE.
• Data exploration — understand the schema of an unfamiliar dataset before writing code to process it.
• Documentation — use the tree view to explain a JSON structure to non-technical stakeholders.

Frequently Asked Questions

Is the JSON viewer free?

Yes — completely free, no account required, no usage limits.

Is my data private?

All parsing and rendering happens in your browser. Nothing is ever sent to a server.

What JSON syntax is supported?

Standard JSON (RFC 8259) — objects, arrays, strings, numbers, booleans, and null values with arbitrary nesting depth.

Can I view minified JSON?

Yes. Click "Format" to pretty-print minified JSON first, then the tree renders automatically.