Example of using a localStorage check to test if a browser has access to local storage and using the check as a before filter in Iron Router for Meteor.

gistfile1.coffee

# Function to check localStorage availability

  hasStorage = ->
    try
      mod = new Date
      localStorage.setItem mod, mod.toString()
      result = localStorage.getItem(mod) == mod.toString()
      localStorage.removeItem mod
      return result
          
  checkLocal = localStorage.getItem("whateverIsInLocalStorage") if hasStorage()
  
  if checkLocal?
    Session.set("whatYouNeedInMeteor", checkLocal)
  else
    ###
      In this example, I'm pulling the session data set here into a template. On the template side, I
      return an empty string if the variable below is null or empty.
    ###
    Session.set("whatYouNeedInMeteor", null)

# Route Definitions 

Router.map ->
  
  # HOME 
  
  @route 'home', 
    path: '/'
    before: alreadyVisited
    template: 'home'
    layoutTemplate: 'publicLayout'