How to load json file in codeigniter... newbie

[eluser]danny_ci[/eluser]
I have see the manual about the json decoden and json encode.
But i have the problem with json data.
There is 2 ways to pass the json data :
1. It write to some file
2. It write to javascript

But write to javascript there is some limit length for the javascript.
So i have to write to json file.

Thanks before