JSON Flatten / Unflatten

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Flatten nested JSON into dot-notation keys, or rebuild it from them.

100% Client-Side Processing • Your Data Never Leaves Your Browser

About JSON Flatten / Unflatten

Turn a deeply nested JSON object into a single-level object with dot-notation keys (user.name, user.tags[0]) — handy for feeding into flat systems like environment variables, spreadsheets, or key-value stores. Run it in reverse to rebuild the original nested structure from flattened keys.

Everything runs locally in your browser.

Key Features

Flatten nested objects/arrays into dot + bracket-index keys

Unflatten dot-notation keys back into nested JSON