Paste JSON and explore it as a collapsible tree. Expand and collapse objects and arrays, see types at a glance, and find your way around large payloads.
A formatter pretty-prints the whole text. The tree viewer turns the JSON into an interactive, collapsible outline so you can fold away the parts you do not care about and drill into deeply nested objects and arrays, which is far easier for large API responses.
Yes. It parses the JSON as you type and shows a clear error message if it is invalid, including where the problem is, so it doubles as a quick validator.
No. Parsing and rendering happen entirely in your browser, so even sensitive API payloads stay on your device.