How is this different from the JSON Formatter?

The formatter outputs readable indented text; the viewer renders an interactive tree you can expand and collapse to explore structure.

What happens if my JSON is invalid?

You'll see a parse error instead of a tree — fix the syntax and it will render automatically.

Is there a size limit?

Very large JSON (tens of megabytes) may be slow to render since the whole tree is built in the browser.

JSON Viewer

Paste JSON and explore it as a collapsible tree. Expand or collapse any object or array to navigate large or deeply nested payloads.

How to Use JSON Viewer

1
Paste your JSON data into the input area.
2
Explore the result as a collapsible tree.
3
Expand or collapse any object or array to navigate the data.

JSON Viewer Features

Nested objects and arrays under two levels deep are auto-expanded for quick scanning.
Handles large, deeply nested payloads without freezing the page.
Runs entirely in your browser — nothing is uploaded.

Why use Tool King?

Fast

No waiting rooms or sign-ups. Most files are ready in seconds.

Private

Files are processed in memory and discarded right after — never stored or shared.

Free

Every tool is free to use, with no hidden limits on the essentials.

Frequently Asked Questions

Related guides

A quick guide to formatting and validating JSON

Turn minified or messy JSON into something readable — and catch syntax errors fast.

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