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.
How it works
Tree Editor, without the upload.
Add your data
Paste a value, open a local file or begin with the working sample.
Run the tool
The transformation executes in your browser, not on our servers.
Review the result
Check the output, then copy or download it for your next task.
Important limitations
What to check before using the result
Review required
Very large or deeply nested documents may require the dedicated large-file viewer.
Review required
A visual tree helps exploration but does not validate an external data contract by itself.
Common questions
About Tree Editor
Does JSON Tree Viewer & Editor upload my data?
No. Your input is processed by code running in your browser and is not sent to an application server.
Is Tree Editor free to use?
Yes. The tool is free, requires no account and can be used directly in the browser.
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.