JSON Tree Viewer
Browse JSON as a tree
What Is This Tool?
The JSON Tree Viewer renders a JSON document as an interactive, collapsible tree so you can explore deeply nested data without scrolling through raw, unindented text. Objects and arrays expand and collapse individually, and every value shows its type at a glance. It's a fast way to get your bearings in a large or unfamiliar JSON payload. Everything runs locally in your browser.
How to Use
Paste your JSON document into the box.
Click Render Tree to build the interactive tree view.
Click any object or array node to expand or collapse it, or use Expand All / Collapse All.
Features
- Collapsible/expandable nodes for every object and array
- Object and array nodes labeled with their key and size, e.g.
"items": Array(3) - Scalar values styled distinctly by type: strings, numbers, booleans, and null
- Expand All and Collapse All controls for the whole tree
- Built entirely with safe DOM APIs, never raw HTML injection
- 100% client-side — nothing leaves your browser
Examples
JSON:
{
"user": {
"name": "Ada",
"roles": ["admin", "editor"],
"active": true,
"manager": null
}
}
Rendered as a tree, user and roles appear as expandable nodes labeled with their type and size (Object or Array(2)), while name, active, and manager appear as leaf nodes showing their value styled by type.
Common Use Cases
- Getting oriented in a large or deeply nested API response
- Reviewing a config file's structure before editing it
- Explaining a JSON payload's shape to a teammate
- Spotting a missing or unexpectedly null field quickly
Frequently Asked Questions
What do the labels like "Array(3)" mean?
They show the node's type and size at a glance: Array(3) is an array with 3 elements, and Object marks a plain object node. This lets you see how big a collapsed section is before expanding it.
How do I expand or collapse a single node?
Click directly on the object or array's label to toggle just that node open or closed, the same way a native disclosure widget works.
What does Expand All / Collapse All do?
Expand All opens every object and array node in the tree at once, and Collapse All closes every node at once, regardless of how deeply nested they are.
How are strings, numbers, and null shown differently?
Strings are shown in quotes, numbers and booleans are shown as-is with distinct styling, and null is shown as a dimmed, italicized value, so you can tell the value's type without reading the raw JSON.
Is my JSON data uploaded anywhere?
No. Parsing and rendering happen entirely in your browser using JavaScript. Nothing is sent to a server.
What happens if my JSON is invalid?
The tool reports a parsing error describing what's wrong, and no tree is rendered until the JSON is valid.
Is there a limit to how deeply nested the JSON can be?
No fixed limit is enforced, but extremely large or deeply nested documents may render slowly in the browser since every node is built as a DOM element.