For meteor

router.query.js

Router.query = (function(router) {
  var current = function () {
    return router.current();
  };

  var rawParams = function () {
    return current().params.query;
  };

  var params = function () {
    return EJSON.clone(rawParams());
  };

  var sanitize = function (query) {
    _.each(query, function(v, k) {
      if (!v)
        delete query[k];
    }); // Remove empty values
    return query;
  }

  return {
    set: function(query) {
      query || (query = {});
      router.go(current().route.getName(), current().params, { query: sanitize(query) });
    },

    isSet: function(name, value) {
      var param = rawParams()[name];
      if (!value) {
        return !!param;
      } else {
        return param == value;
      }
    },

    toggle: function(name, value) {
      if (this.isSet(name, value)) {
        this.remove(name);
      } else {
        this.add(name, value);
      }
    },

    change: function (query) {
      query || (query = {});
      this.set(_.extend(params(), query));
    },

    add: function(name, value) {
      var query = params();
      query[name] = value;
      this.set(query);
    },

    remove: function(name) {
      var query = params();
      delete query[name];
      this.set(query);
    },

    clear: function() {
      this.set();
    },

    path: function(query, route) {
      query || (query = {});
      route || (route = current().route);
      return route.path(current().params, { query: sanitize(_.extend(params(), query)) });
    }
  };
})(Router);