JSON Flattener

New

Flatten nested JSON to dot-notation keys or unflatten a flat object back to nested. Custom separator.

Separator

Nested JSON

Flat JSON

{
  "user.name": "Alice",
  "user.address.city": "Wonderland",
  "user.address.zip": "12345",
  "user.roles.0": "admin",
  "user.roles.1": "editor",
  "meta.created": "2025-01-01",
  "meta.active": true
}