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Node.js for beginner
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  • Chapter 3: Authentication using node.js(passport.js) and mongoDb

    @ankit.bhatia
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    As we all know authentication plays an important role in every site. Here In this blog I am explaining how we will authenticate our site in node.js as a backend and mongoDb as a database. To authenticate I am using passport.js which will help to login with facebook,twitter and google etc.

    In this article I am explaining local authentication with a mongoDb backend.

    Prerequisites:

    Install node.js,express.js and mongoDb .For installing them please read my previous blog.

    when all installation are completed then we will create a new project using express.

    express AuthApp
cd AuthApp
npm install

    Next we will install passport module by using below command.

    npm install passport
npm install passport-local

    After completing this we will run our server.

    node app.js

    then our server will start.

    Implementing Local Authentication:Now we will do authentication first we will create the view. Let give the name as login.html.Below is the code for that:

    <html>
  <body>
    <form action="/login" method="post">
      <div>
        <label>Username:</label>
        <input type="text" name="username" />
        <br/>
      </div>
      <div>
        <label>Password:</label>
        <input type="password" name="password" />
      </div>
      <div>
        <input type="submit" value="Submit" />
      </div>
    </form>
  </body>
</html>

    then we will define the route in app.js

    app.get('/login', function(req, res) {
  res.sendfile('views/login.html');
});

    Now we will create login post method to authenticate. For this we will require passport module.

    var passport = require('passport');
var LocalStrategy = require('passport-local').Strategy;

    We also need to add the Passport middleware for authentication to work. Before the line that reads:

    app.use(app.router);
app.use(passport.initialize());
app.use(passport.session());

    Now we will define the login handler routes which are shown below.

    app.post('/login',
  passport.authenticate('local', {
    successRedirect: '/loginSuccess',
    failureRedirect: '/loginFailure'
  })
);

app.get('/loginFailure', function(req, res, next) {
  res.send('Failed to authenticate');
});

app.get('/loginSuccess', function(req, res, next) {
  res.send('Successfully authenticated');
});

    Passport also needs to serialize and deserialize the user instance, so add the following code.

    passport.serializeUser(function(user, done) {
  done(null, user);
});

passport.deserializeUser(function(user, done) {
  done(null, user);
});

     

    By this way we have completed all the step of performing authentication in node js. Now we will
    run our mongoDb server and connect our Db with node js which I have explained in my previous chapter.

    authentication using node js node js passport js authentication
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