Generally I can use QGIS and its DBManager to import data into a PostGIS database. Sometimes that doesn't work perfectly. ogr2ogr can help though. Here are a few approaches to getting data into PostGIS with ogr2ogr.
This is probably the most basic approach:
ogr2ogr -f "PostgreSQL" PG:"dbname=<db name> user=<username> password=<password> host=<host> port=<port #>" input.geojson -nln schema.table
Running this little command seems to work if you have need to specify the geometry type (Source):