Tony Spiro is the Co-Founder of , an API-first for building content-powered apps. Cosmic JS Content Management Platform In this tutorial I’m going to show you how to build a user management app using Node.js and the . Cosmic JS CMS API TL;DR View the full source code on GitHub View the Demo The app will include the following pages: Login Signup Users list (logged in user access only) Getting Started Create a file titled app-server.js file and add the following: // app-server.jsimport express from 'express'import hogan from 'hogan-express'import http_module from 'http'import bodyParser from 'body-parser'import compression from 'compression'import session from 'express-session'import config from './config'import cors from 'cors'const app = express()app.use(cors({credentials: true, origin: true}))app.use(bodyParser.json())app.use(compression())app.engine('html', hogan)app.set('views', __dirname + '/views')app.set('port', process.env.PORT || 3000)app.use(express.static(__dirname + '/public'))app.set('trust proxy', 1) // trust first proxyapp.use(session({  secret: 'keyboard cat',  resave: false,  saveUninitialized: true}))app.use((req, res, next) => {  if (req.url === '/favicon.ico')    return res.end()  // Set global variables  res.locals.year = new Date().getFullYear()  // Set dev  if (process.env.NODE_ENV === 'development')    res.locals.is_dev = true  next()})const partials = {  header: 'partials/header',  footer: 'partials/footer'}require('./routes')(app, config, partials)const http = http_module.Server(app)http.listen(app.get('port'), () => {  console.info('==> 🌎  Go to http://localhost:%s', app.get('port'));}) This is the entry point of our app and serves to initialize everything we need for our user management app. We’re using Express for the Node.js framework, Hogan Express for view rendering from Mustache templates. Express Session is used to initialize and save sessions. We are going to have a couple partials available in our templates, header and footer as all of our pages will share these. Know Your Routes Next let’s take a look at index.js in our routes folder. // Routesmodule.exports = (app, config, partials) => {  require('./home')(app, config, partials)  require('./signup')(app, config, partials)  require('./users')(app, config, partials)  require('./auth')(app, config, partials)  require('./logout')(app, config, partials)  require('./404')(app, config, partials)} Here we have all of our routes. Logging In Let’s take a look at home.js which is the login page for our app: // home.jsimport Cosmic from 'cosmicjs'module.exports = (app, config, partials) => {  app.get('/', (req, res) => {    Cosmic.getObjects({ bucket: { slug: config.COSMIC_BUCKET } }, (err, response) => {      res.locals.cosmic = response      if (req.query.message === 'unauthorized')        res.locals.unauthorized_message = true      return res.render('index.html', {        partials      })    })  })} There is not much going on here, just loading our dynamic content from Cosmic JS, as well as the HTML login form. Looking at the auth.js file, you’ll see this is where the login form will send the data to log the user in. // auth.jsimport Cosmic from 'cosmicjs'import async from 'async'import _ from 'lodash'import bcrypt from 'bcrypt'const saltRounds = 10module.exports = (app, config, partials) => {  // Submit form  app.post('/auth', (req, res) => {    const data = req.body    Cosmic.getObjectType({ bucket: { slug: config.COSMIC_BUCKET } }, { type_slug: 'users' }, (err, response) => {      if (err)        res.status(500).json({ status: 'error', data: response })      else {        async.eachSeries(response.objects.all, (user, eachCallback) => {          if (!_.find(user.metafields, { key: 'email', value: data.email.trim().toLowerCase() }))            return eachCallback()          const stored_password = _.find(user.metafields, { key: 'password' }).value          bcrypt.compare(data.password, stored_password, function(err, correct) {            if(correct)              res.locals.user_found = user            eachCallback()          })        }, () => {          if (res.locals.user_found) {            req.session.user = {              first_name: res.locals.user_found.metafield.first_name.value,              last_name: res.locals.user_found.metafield.last_name.value,              email: res.locals.user_found.metafield.email.value            }            req.session.save()            return res.json({ status: 'success', data: response })          }          return res.status(404).json({ status: 'error', message: 'This user was not found or the email and password are incorrect.' })        })      }    })  })} When the data is sent to /auth the Cosmic NPM module searches for the email first then, if found tries to match the submitted password to the password saved in the Cosmic JS API (using ). If both email and password are matched with a user, the session is created and the user is redirected from the login page to the users page. Let’s take a look at the users list page. bcrypt Access Exclusive Content After the user has logged in successfully, they are redirected to the users list page. This is how it looks: app.get('/users', (req, res) => {  if(!req.session.user)    return res.redirect('/?message=unauthorized')  res.locals.user = req.session.user  async.series([    callback => {      Cosmic.getObjectType({ bucket: { slug: config.COSMIC_BUCKET } }, { type_slug: 'users' }, (err, response) => {        res.locals.users = response.objects.all        callback()      })    },    callback => {      Cosmic.getObjects({ bucket: { slug: config.COSMIC_BUCKET } }, (err, response) => {        res.locals.cosmic = response        return res.render('users.html', {          partials        })      })    }  ])}) If the user session is not set, they are immediately redirected to the login page with an unauthorized message. If they have a user session, they will be able to see a list of all registered users (from the Users Object Type). This gives you the idea of how to limit user access in our app. By checking for req.session.user on any page, you can restrict access to logged in users only. Signing Up Let’s take a look at what happens for new users when they post their info to /users: app.post('/users', (req, res) => {  const data = req.body  async.series([    callback => {      let user_found = false      Cosmic.getObjectType({ bucket: { slug: config.COSMIC_BUCKET } }, { type_slug: 'users' }, (err, response) => {        _.forEach(response.objects.all, user => {          if (_.find(user.metafields, { key: 'email', value: data.email.trim() }))            user_found = true        })        if (!user_found)          return callback()        // User found        return res.status(409).json({ status: 'error', message: 'Email already in use' })      })    },    callback => {      bcrypt.hash(data.password, saltRounds, function(err, hash) {        res.locals.hash = hash        callback()      })    },    callback => {      // Send to Cosmic      const object = {        type_slug: 'users',        title: data.full_name,        metafields: [          {            title: 'First name',            key: 'first_name',            type: 'text',            value: data.first_name          },          {            title: 'Last name',            key: 'last_name',            type: 'text',            value: data.last_name          },          {            title: 'Password',            key: 'password',            type: 'text',            value: res.locals.hash          },          {            title: 'Email',            key: 'email',            type: 'text',            value: data.email.trim().toLowerCase()          }        ]      }      if (config.COSMIC_WRITE_KEY)        object.write_key = config.COSMIC_WRITE_KEY      Cosmic.addObject({ bucket: { slug: config.COSMIC_BUCKET } }, object, (err, response) => {        if (err)          res.status(500).json({ status: 'error', data: response })        else          res.json({ status: 'success', data: response })        res.end()      })    }  ])}) There’s a few things happening here. First, the email is checked against the current list of users. If a match is not found, the user object is created with each data point of the user: First Name, Last Name, Email and Password stored as metafields in the Cosmic JS API. Taking this a step further, after you log into your Cosmic JS bucket and go to your Users Object Type you will be able to add more Metafields to the users in your system. This makes adding dynamic, extended data very easy. For example, let’s say you needed to add a profile image, address, GitHub username, etc. All of these can be added as Metafields to the User Object. See screenshot below: See Ya Next Time Now let’s see what happens when a user accesses the /logout route: // logout.jsmodule.exports = (app, config, partials) => {  app.get('/logout', (req, res) => {    req.session.destroy()    return res.redirect('/')  })} The session is simply destroyed and the user is redirected back to the login page. Where’s the HTML? I’m not going to go into too much detail on the HTML, but basically both login and signup forms have JQuery validation and submit AJAX requests to the route endpoints. to see how JQuery is used for this and other UI and UX things. Check out the main.js file on GitHub Conclusion And that’s it. Cosmic JS is a powerful platform for content creation and app data management. With your Cosmic JS-powered User Management App you can now extend your user data using the Cosmic JS API or from your Cosmic JS Bucket Dashboard. I hope you found this tutorial helpful. If you have any questions or feedback you can or . reach out to us on Twitter chat with us in the Slack community

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