JSON Keys Extractor

List every key path in a JSON document so you can quickly map, document or diff the shape of a payload. When an API response is deeply nested it is hard to see at a glance which fields exist, and this tool solves that by walking the whole structure and printing each unique dot notation path down to its leaves. Nested object keys are joined with dots, array elements are shown with bracketed indices, and the resulting list is sorted so you can scan it or paste it into documentation. It is a fast way to build a field checklist, sanity check that a required key is present, or compare two responses. Paste your JSON, click extract, and copy the list of paths. Everything runs locally in your browser, so the payloads you inspect are never uploaded or stored on a server.