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JSON Flatten / Unflatten Tool

Flatten nested JSON into dot notation paths or rebuild nested JSON from flattened key paths directly in your browser.

Paste nested JSON to flatten, or flattened key-path JSON to rebuild into a nested object.

Flatten mode

Converts nested objects into flat dot notation keys.

Output

Flattened or unflattened JSON will appear here.
JSON processing happens directly in your browser. Your input is not uploaded to a server.

Flattening and Rebuilding Nested JSON for Data Workflows

Nested JSON is common in API responses, configuration files, logs, analytics exports, and structured data. Flattening JSON makes deeply nested values easier to inspect, compare, store in spreadsheets, or map into key-value workflows.

This JSON Flatten / Unflatten Tool lets you convert nested objects into dot notation keys and rebuild flat JSON back into nested objects. It is useful when debugging APIs, preparing data transformations, comparing payloads, or cleaning structured exports.

How to Use the JSON Flatten / Unflatten Tool

  1. Select whether you want to flatten or unflatten JSON.
  2. Paste valid JSON into the input area.
  3. Click Flatten JSON or Unflatten JSON.
  4. Review the output and copy it for your workflow.

Common Use Cases

  • Flattening API responses for debugging.
  • Preparing JSON for spreadsheet-style inspection.
  • Converting nested configuration data into key-value paths.
  • Rebuilding flat dot notation data into nested JSON.
  • Comparing nested structures more easily during development.

Example Flattened JSON

{
  "user.profile.role": "developer",
  "settings.notifications.email": true
}

Frequently Asked Questions

What does flattening JSON mean?

Flattening JSON converts nested objects into a single-level object where each key represents the original nested path.

What does unflattening JSON mean?

Unflattening JSON rebuilds a nested object from flat keys such as user.profile.name or settings.notifications.email.

Does this support arrays?

Yes. Arrays are flattened using numeric path segments and can be rebuilt where numeric keys indicate array indexes.

Is my JSON uploaded anywhere?

No. The flattening and unflattening process happens directly in your browser.