JSON Viewer
Explore large or deeply nested JSON as a collapsible tree — expand only the branches you need, see array lengths and value types at a glance. Runs in your browser; nothing is uploaded.
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About JSON Viewer
JSON Viewer turns JSON into an interactive tree so you can explore large API responses and deeply nested data without scrolling through thousands of lines. Click any object or array to expand or collapse it; the number of items is shown next to each one.
Values are colour-coded by type — strings, numbers, booleans and null — which makes mistakes such as a number stored as text easy to spot. Everything runs locally in your browser — the text you paste is never uploaded.
How to use JSON Viewer
- Paste JSON or upload a .json file.
- Press View Tree.
- Click the arrows to expand or collapse objects and arrays.
Key features
- Collapsible tree of objects and arrays
- Item counts for every object and array
- Values colour-coded by type
- Reads files from your device without uploading them
When to use JSON Viewer
- Exploring a large API response to find the field you need.
- Understanding the structure of an unfamiliar JSON file.
- Checking array lengths and value types quickly.
Tips and common problems
- Collapse top-level branches and open only the path you are interested in.
- Numbers stored as text (shown as strings) are a common cause of bugs.
- To extract specific values, try JSONPath Evaluator.
Frequently asked questions
It depends on your device's memory because everything runs in the browser. Files of several megabytes work well on a normal computer.
The tree is for viewing. Edit the text in the input box (or in JSON Formatter) and press View Tree again.
Yes — use XML Viewer or YAML Viewer.