JSON Flatten / Unflatten

Nested JSON

{
  "user.name": "Ada",
  "user.roles[0].name": "admin",
  "user.roles[1].name": "editor",
  "active": true,
  "tags": [],
  "meta": {}
}

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Flatten nested JSON into dot-path keys

Paste nested JSON and get a single flat object whose keys are dot/bracket paths — object keys joined by `.`, array indices in bracket form like `order.items[0].sku`. Flat dot-path objects are how people express i18n message catalogs, feature-flag overrides, and Firestore/MongoDB partial updates, and they make deeply nested JSON diffable and grep-able. Empty objects and empty arrays are kept as leaf values so the conversion round-trips losslessly.

Known limitation: object keys are assumed not to contain `.`, `[`, or `]`, which are reserved as path separators.