JSON Reader & Viewer — Free Online Tool
Explore JSON as a collapsible, colour-coded tree — privately in your browser.
About JSON Reader & Viewer
The JSON Reader turns raw JSON into an interactive, collapsible tree so you can explore even large, deeply nested documents with ease. Expand and collapse objects and arrays, see the type and length of each node, and read values clearly with syntax colouring.
It validates the JSON as it parses and reports errors precisely. Everything runs in your browser, so your data is never uploaded — making it safe for API responses and config files.
How to Use JSON Reader & Viewer
- Paste JSON or upload a .json file.
- Click Render Tree.
- Expand/collapse nodes to explore the structure.
- Use Expand All / Collapse All for quick navigation.
Key Features
Interactive collapsible JSON tree
Validation with clear error messages
Type and length labels on nodes
Expand all / collapse all
Paste or upload .json — 100% private
Frequently Asked Questions
How do I view a JSON file?
Paste JSON into the box or upload a .json file, then click Render Tree. The data appears as a collapsible tree you can expand and collapse to explore nested structures.
Does it validate my JSON?
Yes. If the JSON is invalid, the tool shows a clear error message with the reason instead of a broken tree.
What's the difference from a JSON formatter?
A formatter pretty-prints text; this reader renders an interactive tree so you can navigate large, deeply nested JSON, expand only what you need, and read it like a structure.
Is my JSON uploaded anywhere?
No. Parsing and rendering happen entirely in your browser, so your data stays private.