How are arrays flattened?

With array indexes enabled, items become keys like tags[0], tags[1]. Disable to keep arrays as JSON values.

Can I unflatten bracket keys?

Yes. Unflatten rebuilds nested objects and arrays from keys like user.address.city and items[0].

Flatten nested JSON to dot-notation keys or rebuild nested objects from flat JSON. Supports custom delimiters and array index notation.

Your data never leaves your browser

Mode

Delimiter

Array indexes (items[0])

Nested JSON

Flattened JSON

Flatten / UnflattenDot notationArray indexesDownload JSONFullscreen

Nested to flat

{"user":{"name":"Ada","age":36}}

{"user.name":"Ada","user.age":36}