JSON Viewer — Format, Validate & Explore JSON Online
Paste or upload JSON to browse an interactive collapsible tree, view syntax-highlighted raw output, validate instantly, and inspect structure stats. Free, no registration required.
All processing happens locally in your browser. No data is sent to any server.
JSON Input
Upload JSON File
Drag & drop or browse files
Up to 10 MB
Max file size: 10 MB
Paste or upload a JSON file to get started
Supports any valid JSON — objects, arrays, primitives
How to Use
Paste or Upload
Paste your JSON into the text area or upload a .json file up to 10 MB.
Explore the Tree
Browse the interactive tree view — expand or collapse any node, or search keys and values to highlight matches.
Copy or Download
Copy the formatted JSON to your clipboard or download it as a .json file.
Why Use Our Tool?
Live Validation
Instantly see whether your JSON is valid. A detailed parse error points you to the exact problem.
Interactive Tree
Collapse and expand any object or array node to navigate even the most complex nested structures.
Structure Stats
At-a-glance metrics: max nesting depth, total keys, strings, numbers, booleans, and null values.
100% Private
Everything runs in your browser — your JSON is never uploaded to any server.
Frequently Asked Questions
What does the JSON Viewer do?
It parses and displays your JSON in an interactive tree view with collapsible nodes, syntax highlighting, and structure statistics. You can also switch to formatted raw JSON and download the result.
Can it validate my JSON?
Yes. The tool instantly validates your JSON as you type and shows a clear parse error message with the exact issue if the input is invalid.
What does the Max Depth stat mean?
Max Depth indicates the deepest level of nesting in your JSON. A flat object has depth 1, while an object containing nested arrays or objects will have a higher depth value.
How does search work in Tree View?
Typing in the search box highlights matching keys and string values throughout the tree. All nodes are automatically expanded while search is active so no match is hidden.
Is my JSON data sent to a server?
No. All processing runs entirely in your browser using JavaScript. Your JSON data never leaves your device.
Is there a file size limit?
The viewer supports JSON files up to 10 MB. For very large files the Raw JSON view is faster than the Tree View.