If you open a JSON document from the file system, Hackolade will detect its nature and will execute the reverse-engineering of that document. You will need to choose a database target for your model.
If you wish to include the schema for a JSON document in an existing model, the process is slightly different. With your model already opened, choose Tools > Reverse-Engineer > JSON document.
The process includes detection of ISO 8601 date/time/timestamp/duration in strings when target supports such data types.
Hackolade also supports Newline Delimited JSON as described in https://ndjson.org/
The structure of a JSON document can be imported either as an entity in the Entity Relationship Diagram, or alternatively as a model definition so it could be re-used in the model:
If you wish to force the destination of the reverse-engineering operation, you may specify the container in which the entities should be inserted.
For RDBMS targets, an additional option appears, that allows automatic normalization of complex data types: