Free JSON Viewer & Tree Explorer Online
Visualize JSON as an interactive collapsible tree — expand, collapse, and explore nested structures instantly.
How it works
Paste your JSON
Paste any valid JSON into the input field.
View tree
Click View JSON or press Ctrl+Enter to render the interactive tree.
Expand and collapse
Click any object or array node to expand or collapse it.
Inspect values
Strings, numbers, booleans, and nulls are color-coded for easy scanning.
Common use cases
Exploring API responses
Paste deeply nested API responses into the viewer to explore the structure without squinting at formatted text.
Understanding JSON schema
Visualize a JSON schema or large config file as a tree to understand the hierarchy before writing code to traverse it.
Debugging nested data
Expand specific branches of a large JSON response to find the exact value you're looking for.
Teaching JSON
The tree view makes the parent-child relationships between objects and arrays immediately clear for learners.
Frequently asked questions
Can I collapse large objects?
Yes — click any { } or [ ] label to toggle its contents. Large arrays and objects start collapsed if they exceed a certain size.
Are all value types shown differently?
Yes — strings are green, numbers are blue, booleans are orange, null is grey, and object/array keys are the text color.
Is my JSON validated first?
Yes — the viewer uses JSON.parse which will throw on invalid JSON. Use the JSON Validator to diagnose errors first.
Does my data leave the browser?
No. The tree is built entirely from JavaScript in your browser tab. Nothing is transmitted.