JSON Viewer
View and explore JSON data in a tree structure
JSON Viewer turns raw JSON into a collapsible tree so you can inspect deeply nested API responses without squinting at braces. Invalid input is flagged immediately with the reason it failed to parse.
All processing runs locally in your browser. Your files and text are not sent to Tool-web's server.
How to Use
- Paste your JSON data
- Explore the tree-structured view
- Expand or collapse the tree
- Format, minify, or validate the JSON
Features
- Tree-structured display
- Expand or collapse the tree
- Syntax highlighting
- Format, minify, and validate
- Copy or clear the output
Tips for getting JSON Viewer right
- Paste minified API responses straight in — formatting is handled automatically
- Collapse branches you've already reviewed to keep long responses navigable
- If parsing fails, look for trailing commas and single quotes first — they cause most errors
How errors are reported
Parsing uses the browser's native JSON parser. When input is invalid you'll see a descriptive error rather than a blank screen — typically pointing at unexpected tokens such as trailing commas, unquoted keys, or truncated input from copying half a payload.
Worked example
Given {"user": {"id": 42, "tags": ["admin", "beta"]}}, the tree renders user → id and user → tags as expandable nodes, letting you confirm the shape of a response before writing code against it.
Frequently Asked Questions
How is this different from the JSON Formatter?
Can I copy specific values?
Does it handle very large JSON?
Privacy & Security
Viewing is entirely local. JSON payloads — including anything with credentials — never leave your browser.
Tips & Best Practices
- Paste minified API responses straight in — formatting is handled automatically
- Collapse branches you've already reviewed to keep long responses navigable
- If parsing fails, look for trailing commas and single quotes first — they cause most errors
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