app.js

/**
 * Module dependencies.
 */
var prismic = require('prismic-nodejs');
var app = require('./config');
var configuration = require('./prismic-configuration');
var PORT = app.get('port');

// Returns a Promise
function api(req, res) {
  // So we can use this information in the views
  res.locals.ctx = {
    endpoint: configuration.apiEndpoint,
    linkResolver: configuration.linkResolver,
    dateConverter: configuration.dateConverter
  };
  return prismic.api(configuration.apiEndpoint, {
    accessToken: configuration.accessToken,
    req: req
  });
}

function handleError(err, req, res) {
  if (err.status == 404) {
    res.status(404).send("404 not found");
  } else {
    res.status(500).send("Error 500: " + err.message);
  }
}

app.listen(PORT, function() {
  console.log('Express server listening on port ' + PORT);
});

app.route('/preview').get(function(req, res) {
  api(req, res).then(function(api) {
    return prismic.preview(api, configuration.linkResolver, req, res);
  }).catch(function(err) {
    handleError(err, req, res);
  });
});

app.route('/:uid').get(function(req, res) {
  var uid = req.params.uid;
  api(req, res).then(function(api) {
    api.getSingle("site-layout").then(function(layout) {
      api.getByUID('article', uid).then(function(pageContent) {
        if(pageContent.uid != uid){
          return res.redirect("/"+pageContent.uid);
        }
        res.render('article', {
          layout: layout,
          pageContent: pageContent
        });
      }).catch(function(err) {
        handleError(err, req, res);
      });
    }).catch(function(err) {
      handleError(err, req, res);
    });
  });
});

// Route for homepage
app.route('/').get(function(req, res) {
  api(req, res).then(function(api) {
    api.getSingle("site-layout").then(function(layout) {
      api.query(
        prismic.Predicates.at("document.type", "article"),
        { orderings: '[my.article.date desc]' }
      ).then(function(articles) {
        res.render('homepage', {
          layout: layout,
          articles: articles.results
        });
      }).catch(function(err) {
        handleError(err, req, res);
      });
    }).catch(function(err) {
      handleError(err, req, res);
    });
  });
});