404 on including javascript

I have a node.js app that loads a signup form when visiting localhost/user/signup:

html
  head
    script(type='text/javascript',src='https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js')
    script(type='text/javascript',src='javascripts/validator.js')
    script(type='text/javascript',src='javascripts/signupValidation.js')
  body
    p(id='error', style='display:none;')#{error}
    form(id='signup',method='post',action='/signup')
      label(for='firstname') Firstname
      input(type='text', name='firstname')
      label(for='lastname') Lastname
      input(type='text', name='lastname')
      label Username
      input(type='text', name='username')
      label Password
      input(type='password', name='password')
      label Password again
      input(type='password', name='password2')
      label Email
      input(type='email', name='email')

      input(type='submit',value='Sign up', onclick="")

but when I access the page the server console logs a 404 error getting the JavaScript files, it was working fine until only resonantly when I changed the signup page to be loaded from localhost/signup to localhost/user/signup:

app.get('/signup',user.signupForm);

to:

app.get('/user/signup',user.signupForm);

From you question I assume, that you did not move the JavaScript files along, so your directory structure looks like this:

localhost
|- user
|-- signup
|- javascripts

In that case, the relative paths of you JavaScript files have to be changed in order to point towards the correct files:

script(type='text/javascript',src='../javascripts/validator.js')
script(type='text/javascript',src='../javascripts/signupValidation.js')

Remember that if you don't use absolute paths, paths are always treated as relative to the current directory, so in your case the system is searching for the JavaScript files in localhost/user/javascripts/, which does not exist and thus results in the 404 errors!