Online JSON Viewer & Explorer
PureJSON Viewer lets you visualize JSON data in an interactive tree view. Paste your JSON, and instantly see the structure with syntax highlighting. All processing happens in your browser — your data never leaves your device.
How to Use
- Paste or upload — Paste your JSON into the editor or click 'Open File' to load a JSON file from your device.
- Explore the tree — Switch to Tree view to interactively expand and collapse nodes. Hover over values to see their types.
- Copy or edit — Use the Code view to edit JSON directly with syntax highlighting, or copy the content to your clipboard.
Key Features
- Interactive tree view with expand/collapse for all nodes
- Syntax highlighting with Monaco Editor (same engine as VS Code)
- Dual view mode: switch between Code and Tree views instantly
- Load JSON from file or paste from clipboard — works with large files
Use Cases
- Debugging API responses — paste the raw JSON to quickly inspect nested structures
- Exploring configuration files — navigate complex config files with the tree view
- Validating JSON structure — instantly see if your JSON is well-formed or contains errors
Frequently Asked Questions
Is my JSON data sent to any server?
No. PureJSON processes everything 100% client-side using your browser. No data is ever transmitted to any server.
Can I use PureJSON offline?
Yes! PureJSON is a Progressive Web App (PWA). Install it from your browser and use it without an internet connection.
What is the maximum JSON size supported?
PureJSON can handle JSON files up to several megabytes, limited only by your browser's memory.
Does PureJSON validate my JSON?
Yes. If you paste invalid JSON, the editor will highlight syntax errors and the tree view will show an error message indicating the issue.
Can I edit JSON in the viewer?
Yes. The Code view provides a full-featured editor with syntax highlighting, auto-completion, and bracket matching. Changes are reflected in the tree view in real time.