Convert huge text file into Json format

Convert huge text file into Json format

I have a question. I have a text file with format as follow
product/productId: ID
review/userId: ID
review/profileName: Name
review/helpfulness: 2/2
review/score: 5.0
review/time: 1314057600
review/summary: Text_Summary
review/text: Text1

product/productId: ID
review/userId: ID
review/profileName: Name
review/helpfulness: 0/0
review/score: 5.0
review/time: 1328659200
review/summary: Text_Summary
review/text: text

.. so on and so forth
Is there any way i can convert it to any structured data such as JSON or
CSV ? My problem here is the repetion of the column name (
product/productID, review/xxx )
Thanks in advance