Visualize JSON data as an interactive collapsible tree with type annotations.
Enter the JSON data you want to visualize as a structure.
Expand and collapse nodes to navigate the data hierarchy.
Click any node to see its type, path, and full value.
Nested JSON becomes a navigable hierarchy instead of a wall of punctuation. JSON Structure Visualizer presents objects and arrays as expandable branches, with annotations that distinguish JSON value types while preserving their parent-child relationships. It is a structural viewer, not a schema generator or query builder. A common surprise is that numeric-looking or boolean-looking text remains a string: "42" differs from 42, and "false" differs from false, because the JSON syntax determines each value's type.
A concrete input and expected output from the current implementation.
Input
{
"ready": true,
"items": [3, null]
} Expected output
A root object branch with two children: ready, annotated as a boolean with value true, and items, annotated as an array. Expanding items reveals a first element annotated as a number with value 3 and a second element annotated as null.
The outer braces define one object, while the brackets define an array nested under items. The array contains exactly two values: the number 3 and the JSON literal null.
After the pasted text is accepted as JSON, object property names become keyed children and array members become ordered children. Nested objects and arrays create additional branches. Strings, numbers, booleans, and null remain leaf values and are marked with their JSON types. Source whitespace and indentation do not create nodes because they are not part of the parsed data structure.
Container nodes can be opened to reveal their descendants or closed to hide them, allowing one deeply nested section to remain visible while unrelated sections are compact. Expanding or collapsing changes only the tree's visible state. It does not change property names, array order, scalar values, or the types inferred directly from the pasted JSON.
No. Type annotations describe the values present in the pasted instance, but they do not establish required fields, allowed ranges, string formats, alternative shapes, or additional-property rules. Use a validator with the relevant JSON Schema or API definition when conformance matters. The visualizer is useful first for understanding the instance that would be validated.
The visualization is created entirely in the browser, and the pasted JSON is not uploaded by this tool. That makes it suitable for locally inspecting data that should not be sent to a processing service. You should still remove secrets before sharing screenshots or copied output, since visible values remain part of what other people can see.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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