JSON Visualizer
Paste JSON to inspect nested objects and arrays in a collapsible tree, making long API responses and configuration data easier to navigate.
Paste JSON to explore its objects and arrays as a collapsible tree. Input is parsed locally and is not executed.
JSON root values can be objects, arrays, strings, numbers, booleans, or null. For responsiveness, the tree is limited to 20,000 values and 40 nested levels.
🔒 All processing happens in your browser — files never leave your device. Your input stays in this browser and is not uploaded to Smart Online Tools.
How it works
- Paste or edit JSON.
- Select Visualize JSON.
- Expand or collapse branches to inspect values.
Good to know: The visualizer checks JSON syntax only. It does not validate an API schema or execute the data.
Privacy and processing
All processing happens in your browser — files never leave your device. Your input stays in this browser and is not uploaded to Smart Online Tools.
Frequently asked questions
Does JSON support comments?
Standard JSON does not. Remove comments before validating it.
Can a formatter repair invalid JSON automatically?
It can only format valid input. Fix syntax errors first, then format.
Is JSON the same as JavaScript object syntax?
No. JSON is stricter: keys and strings require double quotes, and executable expressions are not allowed.
What does JSON Visualizer do?
Explore JSON objects and arrays as a collapsible tree. Paste JSON to inspect nested objects and arrays in a collapsible tree, making long API responses and configuration data easier to navigate.
Does this tool upload my files or input?
Your input stays in this browser and is not uploaded to Smart Online Tools.