Batch variable echo

I'm trying to save user input variables from a batch file into a text file. So that some javascript can read the file to use the variables.

This is what I have so far:

:varechoecho %GAMEPIN% > variables.txtecho %NICKNAME% >> variables.txtgoto launch

This just writes "ECHO is off" into the variables.txt:

How would I get the contents of the variables into the file?