What is JSON Tree Viewer?
JSON Tree Viewer makes deeply nested API responses, configuration, and debug data easier to explore. It validates the document, renders objects and arrays as collapsible nodes, and searches both keys and values. Node and depth limits protect the browser from unusually large or hostile input. Common workflows include the following. Explore nested fields in a large API response. Collapse unrelated branches while reviewing one object or array. Locate deep data by key, number, or text value. The page also documents input boundaries, output behavior, and practical cautions so you can review the result before putting it into an application, configuration, test, or production workflow.
When to use it
- Explore nested fields in a large API response.
- Collapse unrelated branches while reviewing one object or array.
- Locate deep data by key, number, or text value.
How to use it
- Paste valid JSON.
- Build the tree and expand or collapse branches.
- Use search to locate keys or values.
- Load one of the realistic examples first to verify the selected options and processing direction before replacing it with your own data.
- Review the output, status message, and documented limits; copy, download, or continue only after the result matches your expectation.
Runnable examples
The “Example 1” and “Example 2” buttons load the matching inputs. They cover different structures, directions, or boundaries and can be run directly in the workspace.
Example 1
{"project":{"name":"JSONLane","locales":["zh-cn","en"],"release":{"tools":20,"checks":{"unit":true,"e2e":true}}}}Example 2
{"teams":[{"name":"frontend","tasks":["theme","content"]},{"name":"quality","tasks":["lint","build"]}],"version":"1.5"}Input rules
- Input must be valid JSON.
- Unsafe integers, invalid syntax, and structures beyond the limits are rejected.
- Duplicate keys are reported; the tree can display only the retained value.
- Text input is counted before processing and is limited to 1,000,000 characters on this page; file modes apply the separate file limit shown in the workspace.
- Integers outside JavaScript's safe range are rejected.
Output rules
- Objects render key/value nodes and arrays render numeric indexes.
- Search matches keys and textual value representations.
- Collapsing nodes changes only the view, not the data.
- Output reflects only the current input, direction, and options; rerun after changing a mode or value instead of treating an earlier result as current.
- The viewer limits JSON to 50,000 nodes and 100 levels of nesting.
Limitations and cautions
- Integers outside JavaScript's safe range are rejected.
- The viewer limits JSON to 50,000 nodes and 100 levels of nesting.
- Duplicate keys warn and the last value is displayed.
How your data is handled
Parsing, tree construction, and search happen in the current browser and are never uploaded or persisted.