Flattening converts a nested JSON structure into a single-level object using dot notation for keys. For example, {"user": {"name": "Alice"}} becomes {"user.name": "Alice"}. This simplifies complex data for storage or processing.
Flatten JSON when working with flat key-value stores (Redis, environment variables), creating search indexes, building flat database schemas, or simplifying deeply nested API responses for easier data access.
Yes — switch to Unflatten mode and paste your dot-notation JSON. The tool reconstructs the original nested structure from flat keys, correctly handling arrays and deeply nested objects.