Data
JSON Viewer
Paste JSON and explore it as a collapsible, syntax-highlighted tree — validated as you go, entirely in your browser.
Everything runs locally in your browser — your JSON is never uploaded to a server.
payload.json
About this tool
Comprehensive documentation & audit utility guideA raw JSON blob — an API response, a config file, a Lighthouse report — is unreadable once it's more than a few lines. This tool parses it and renders an interactive tree: every object and array can be collapsed independently, values are color-coded by type, and invalid JSON is caught immediately with the browser's own parser error.
How it works
1
Paste JSON or load a file
Either works — nothing is uploaded either way.
2
Format & validate
Invalid JSON shows the exact parser error.
3
Explore the tree
Collapse nested objects/arrays individually, or use Expand/Collapse all.
Key Features & Capabilities
Syntax validation via the browser's native JSON parser
Collapsible tree for every object and array
Type, size, total key count, and max nesting depth
Copy as pretty-printed or minified JSON