I exported some data from my database in the form of JSON, which is essentially just one [list] with a bunch (900K) of {objects} inside it.
Trying to import it on my
Assuming you have the option to go back and export the data again...:
pg_dump - extract a PostgreSQL database into a script file or other archive file.
pg_restore - restore a PostgreSQL database from an archive file created by pg_dump.
If that's no use, it might be useful to know what you're going to be doing with the output so that another suggestion can hit the mark.