Postgres multiple columns to json

I am running postgresql 9.3.4. I have a table with 3 fields:

id   name  addr
---  ----  ----
1    n1    ad1
2    n2    ad2
...

I need to move the data to a new table with fields like:

id   data
---  ----
1    {'name': 'n1', 'addr': 'ad1'}
2    {'name': 'n2', 'addr': 'ad2'}
...

row_to_json is not the solution for me as SELECT t.id, row_to_json(t) as data FROM (select id, name, addr from myt) t adds id to the as well. Is there a way to choose the fields I need (name & addr) in my data field?