JSON Viewer
JSON Viewer — View & Explore JSON Online Free
What is JSON Viewer?
View and explore JSON data with an interactive tree. Format, validate, and navigate nested structures online.
JSON Viewer displays your JSON data as an interactive, collapsible tree. Paste minified or formatted JSON and use the Tree view in the output panel to expand and collapse objects and arrays. This makes it easy to navigate large JSON structures without scrolling through raw text. The tool formats your JSON with proper indentation and validates syntax, so you can quickly spot structural issues. All processing runs in your browser—your data never leaves your device.
How to Use JSON Viewer
- Paste or type your input into the editor on the left panel.
- Results update automatically while you type. You can also press Ctrl+Enter to force a refresh.
- View the result in the output panel on the right with full syntax highlighting.
- Use Copy or Download to export the result.
- Drag and drop
.jsonor.txtfiles directly into the editor. - Toggle Tree View for an interactive, collapsible view of the JSON structure.
Example
Input:
{"user":{"name":"John","roles":["admin","user"]}}Output:
{
"user": {
"name": "John",
"roles": ["admin", "user"]
}
}Common Use Cases
- Explore API responses
- Debug nested configs
- Inspect JSON structure
JSON Viewer vs Plain Text
Common Errors
- Invalid JSON prevents tree rendering
- Ensure proper quote and comma usage
Why Use Our JSON Viewer?
- 100% client-side — your data never leaves your browser. No server processing, no data collection.
- No sign-up required — start using the tool instantly with no registration or installation.
- Keyboard shortcuts — press Ctrl+Enter to run, ? for shortcuts list, Ctrl+B to toggle sidebar.
- Persistent state — your input is automatically saved across sessions using local storage.
- IDE-style interface — Monaco Editor (the engine behind VS Code) with syntax highlighting and error detection.
- Multi-format conversion — convert between JSON, XML, CSV, and YAML without switching tools.
Frequently Asked Questions
What is a JSON viewer?
A JSON viewer formats and displays JSON in a navigable tree structure so you can expand and collapse nested objects and arrays.
How do I view JSON in tree format?
Paste your JSON into the editor, click Run, then toggle the Tree button in the output panel to see the collapsible view.
Can I view invalid JSON?
No. The viewer requires valid JSON. Use our JSON Validator to fix syntax errors first.
Is my JSON data secure?
Yes. All processing happens in your browser. No data is sent to any server.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data format used for APIs, configs, and data storage.
Try JSON Viewer Now
Paste your data into the editor above for instant processing. Use Ctrl+Enter anytime to re-run quickly.