ExpressJS 3.0 How to pass res.locals to a jade view?

Question

I want to display a flash message after a user fails to sign in but I just can\'t get the variables to show up in my Jade views.

I have some pieces, I know I have t

Answer 1

Just to give a short summary for everyone who has the same problem and got the impression that is was solved changing res.redirect.

It is very important to put your app.use middleware before app.router. See the comments by TJ Holowaychuck, the author of express

• https://groups.google.com/d/msg/express-js/72WPl2UKA2Q/dEndrRj6uhgJ

Here is an example using a fresh installation of express v3.0.0rc4

app.js:

app.use(function(req, res, next){
  res.locals.variable = "some content";
  next();
})

app.configure(function(){
  app.set('port', process.env.PORT || 3000);
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.favicon());
  app.use(express.logger('dev'));
  app.use(express.bodyParser());
  app.use(express.methodOverride());
  app.use(app.router);
  app.use(express.static(path.join(__dirname, 'public')));
});

index.jade:

extends layout

block content
  h1= title
  p Welcome to #{title}
  p= variable

Answer 2

If you are using express.session() you must call your function AFTER express.session() but BEFORE app.router, inside of app.configure().

app.js

app = express();

app.configure(function(){
  app.set('port', process.env.PORT || 3000);
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.logger('dev'));
  app.use(express.bodyParser());
  app.use(express.methodOverride());
  app.use(express.session());

  // Give Views/Layouts direct access to session data.
  app.use(function(req, res, next){
    res.locals.session = req.session;
    next();
  });

  app.use(app.router);
  app.use(express.static(path.join(__dirname, 'public')));
});

index.jade

extends layout

block content   
  h1= title   
  p My req.session.var_name is set to #{session.var_name}