I have set up Syntastic https://github.com/scrooloose/syntastic with vim and I would like to use it for node.js javascript linting. 
I have installed jslint 
$ jslint routes/index.js
routes/index.js
 #1 Expected exactly one space between 'function' and '('.
    module.exports = function(app) { // Line 5, Pos 26
    ....
And I have put this in my ~/.vimrc 
let g:syntastic_jslint_checkers=['jslint']
let g:syntastic_check_on_open=1
let g:syntastic_enable_signs=1
But I get no output on :SyntasticCheck
Yet
Syntastic: active mode enabled
Syntastic info for filetype: javascript
Available checker(s): jslint
Currently enabled checker(s): jslint