JSON Viewer
JSON Viewer
Paste JSON to explore it as a collapsible tree with type badges and item counts.
The JSON Viewer turns raw JSON into a tidy, collapsible tree so you can explore nested data without getting lost. API responses and configuration files often bury the value you need five levels deep inside objects and arrays. Reading that as plain text means counting brackets in your head. A tree view solves it: every object and array becomes a row you can open and close.
Each value carries a small badge showing its type, such as string, number, boolean, null, object, or array, and every container shows how many items it holds. Expand All opens the whole structure when you want the full picture, and Collapse All folds it back when you want an overview.
The viewer runs entirely in your browser using built-in tools. Nothing is uploaded, so it is safe for private API responses and internal data during debugging, learning, or documentation work.
How to use
- Paste your JSON into the box.
- Click View Tree.
- Click any object or array row to expand or collapse that branch.
- Use Expand All or Collapse All to change the whole tree at once.
- Read the type badges and item counts to understand the structure quickly.
Frequently asked questions
What do the badges mean?
A badge names the data type of the value next to it. For objects and arrays it also shows the number of entries inside, which helps you spot empty containers and unexpectedly large lists at a glance.
Can I edit the JSON in the tree?
No. This viewer is for exploring and understanding structure. To change values, edit the text in the input box and build the tree again, or use the JSON Formatter tool on this site.
What happens with invalid JSON?
The tool shows the browser parse error instead of a tree, so you can fix the mistake first. The JSON Validator tool gives the same check in a dedicated view.
Is my data private?
Yes. The tree is built locally in your browser. No data is sent to any server, saved, or tracked.