var ueberDB = require('ueberdb2');

var db = new ueberDB.database('postgres', {
    host: 'localhost',
    user: 'test',
    password: 'test',
    database: 'test'
});

//initialize the database
db.init(function (err) {
    if (err) {
        console.error(err);
        process.exit(1);
    }

    //set a object as a value
    //can be done without a callback, cause the value is immediately in the buffer
    db.set('valueA', {
        a: 1,
        b: 2
    });

    //get the object
    db.get('valueA', function (err, value) {
        console.log('valueA before delete', value);

        db.remove('valueA', function (err) {
            if (err) {
                console.log('Err deleting valueA', err);
            }

            db.get('valueA', function (err, value) {
                console.log('valueA after delete', value);

                db.close(function () {
                    process.exit(0);
                });
            });
        });
    });
});

valueA before delete { a: 1, b: 2 }
valueA after delete { a: 1, b: 2 }

valueA before delete { a: 1, b: 2 }
valueA after delete null

2018-03-22 12:31:09 EET LOG:  statement: CREATE OR REPLACE FUNCTION ueberdb_insert_or_update(character varying, text) RETURNS void AS $$ BEGIN   IF EXISTS( SELECT * FROM store WHERE key = $1 ) THEN     UPDATE store SET value = $2 WHERE key = $1;   ELSE     INSERT INTO store(key,value) VALUES( $1, $2 );   END IF;   RETURN; END; $$ LANGUAGE plpgsql;
2018-03-22 12:31:09 EET LOG:  statement: SELECT 1 as exists FROM pg_tables WHERE tablename = 'store'
2018-03-22 12:31:09 EET LOG:  execute <unnamed>: DELETE FROM store WHERE key=$1
2018-03-22 12:31:09 EET DETAIL:  parameters: $1 = 'valueA'
2018-03-22 12:31:09 EET LOG:  execute <unnamed>: SELECT ueberdb_insert_or_update($1,$2)
2018-03-22 12:31:09 EET DETAIL:  parameters: $1 = 'valueA', $2 = '{"a":1,"b":2}'