JSON Flatten

Flatten nested JSON objects to dot-notation keys or unflatten them back to nested form with a custom separator.

Browser-based JSON Flatten for working with JSON data.

How to use

→Paste your JSON into the input panel.
→The result updates automatically as you type.
→Use the Copy button to copy the output.
→Try a preset from the example picker to see sample input.

Mode

Separator

JSON Input

Output

{
  "user.id": 1,
  "user.name": "Alice",
  "user.address.city": "Berlin",
  "user.address.zip": "10115",
  "settings.theme": "dark",
  "settings.language": "en"
}