Understand unfamiliar payloads
Follow nested objects and arrays when documenting or integrating with a new API.
100% local · files never leave your browser
View tool
JSON Tree Viewer & Editor
Explore nested JSON as a visual tree in your browser. Expand objects and arrays without uploading the document.
✓ Free to use✓ No signup✓ Runs locally
160 bytes · local only
Waiting
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Processed entirely in this tab
Your input and result are not sent to JSON Hearth or stored on a server.
When to use it
What Tree Editor helps you do
A tree view makes deeply nested objects easier to scan than raw text. Expand only the branches you need and use the formatted source beside the structure.
Trace a field path
Work out where a value lives before writing application code or a JSONPath expression.
Review generated JSON
Inspect the hierarchy of exports, configuration and generated fixtures without losing context in long text.
Important limitations
What to check before using the result
- Very large or deeply nested documents may require the dedicated large-file viewer.
- A visual tree helps exploration but does not validate an external data contract by itself.
Common questions
About Tree Editor
Can the tree viewer handle arrays and objects?
Yes. Objects and arrays are displayed as expandable branches, while primitive values appear as leaves.
Does opening a branch modify my JSON?
No. Expanding and collapsing branches changes only the visual view of the parsed document.