Indent on Save?

[rossmcf]

This is more of a question than an issue, but is it possible to indent on save without losing your position in the file? I'm currently have this in my vimrc:

:autocmd BufWritePre *.json :normal gg=G

While it indents well, even if my JSON is invalid, it jumps me to the top of the buffer every time. Can this be avoided?

Thanks,
Ross