Chunked stdout/stderr drops writes if terminated early. #784

Hello,

I have an app which prints a long json to the output and I need to | grep this output in order to parse some data.
It works fine with Node.js but it doesn't with iojs.
It seems the output is chunked in some ways and grep stops before receiving all the data.
I came to this conclusion because when I redirect the output in some file and then cat file | grep it works, everything is there, but iojs app.js | grep won't.

Any ideas on this issue ?
Thanks.