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.
What it checks
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