GZip Compression for Website with Ajax

What do you mean by "i run into js error (because i get a compressed json)"?
Json should remain valid even if compressed.

Could you provide an example of what a request looks like compressed (invalid) and uncompressed (valid), as well as your javascript code which can't parse the compressed code.

If "compress_output" = false, than i get a valid json back.
If "compress_output" = true, i dont get any data back from the api. (But get 200 OK from Server)

@Diederik Thank you, that work. 

@AzrielOmega Mhh that didnt effect the loading-size of my page...