Understand unfamiliar payloads
Prepare readable JSON before following nested objects and arrays in the main workbench's tree.
100% local · files never leave your browser
View tool
JSON Tree Viewer & Editor
Prepare JSON for tree inspection, then open the interactive viewer on the main workbench. Formatting and inspection stay in your browser.
✓ Free to use✓ No signup✓ Runs locally
160 bytes · local only
Waiting
Copy the formatted result, then Open interactive tree viewer and paste it into the main viewer. Your JSON is not automatically transferred.
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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
This page validates and formats JSON text for inspection. To expand objects and arrays, copy the output and open the interactive tree viewer on the main workbench, then paste it into the editor there.
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
- This page shows source and formatted output. Expandable branches are available in the main workbench, and opening it does not transfer your input automatically.
- Very large or deeply nested documents may require the dedicated large-file viewer.
- Preparation parses and serializes JSON, so large numbers or duplicate property names require the same care as formatting. A tree view does not validate an external data contract.
Common questions
About Tree Editor
Where do I expand objects and arrays?
Use Open interactive tree viewer to reach the main workbench. Copy the prepared output first, then paste it into the editor there; objects and arrays appear as expandable branches.
Does opening a branch modify my JSON?
Expanding and collapsing branches in the main viewer changes only the view. Editing or formatting the source is a separate action and can change its values or representation.