Initiating Server



is the primary daemon process for the MongoDB system.

npm start

Starts the node server and executesindex.jsof the project.


Mainly performs three tasks in following order:

  1. MongoDB connection: Mongoose makes a connection to mongoDB.

  2. Socket connection: Starts the socket server (/config/socket.js)

  3. Node server: Starts the node server and configure port (/config/express.js)

MongoDB Models

All the mongoDB models or schemas are defined under /server/models.

Socket Server

Socket-server performs following functionalities :

  1. Starts the socket server

  2. Once when client is connected, it checks for authentication

  3. If successfully authenticated, Socket Handler is called to handle different socket scenarios (/server/socketHanlder/index.js)

Socket Handler

  • messageHandler : Handles all the chat events between users (message-handler.js)

Express JS

Express JS contains all the configuration details related to node server. It performs the following tasks:

  1. Create and start server

  2. Add different middleware namely:

    • bodyParser: Parse body params and attache them to req.body

    • cookieParser: Parse Cookie header and populate req.cookies with an object added as key by the cookie names.

    • Compress: Helps in decreasing the size of the response body and improve the speed of the API calls.

    • Passport: Helps to authenticate different API call.

    • Helmet: Helps to protect the application from different attacks such as cross-site scripting (XSS), script injection.

    • Cors: It helps in connecting the different domain to the application i.e enable cross-origin resource sharing.

    • APIError: Handles any other error that occurred inside of an API calls such as API not found, internal server error, parameter validation error.

    • API route: Manage various other routes of the application (/server/routes/index.js)

Passport JS

This module lets you authenticate endpoints using a JSON web token and passport-jwt. A passport middleware is added to all the routes and socket which will check for authorized token. We can also change the strategy of the passport in the passport-config.jsfile.

Api Routes

It handles the different routes of the application, namely:

  • users: This route contains different routes related to the user such as registration of the new user, fetching user details, etc.

  • auth: Manages the login, checkUser and logout route. This route handles the authentication of the user by generating the token.

  • apartment: Handles the user apartment related route such as getting the apartments of the user, updating apartment details etc.

  • messages: handles the chat related routes such as userMessages, loadMore messages etc.


Following are the controllers defined for the above-mentioned routes:

  • User Controller Performs user related functions, such as:

    • Create new user

    • Get user details

    • Update user-details

    • GetfavouriteUsers

  • Auth Controller Performs user authentication tasks: Login ,LogOut, checkUser

  • Apartment Controller Defines apartment related functions such as getApartments, update apartment details etc.

  • Messages Controller: Defines users chat related functions such as fetch messages, loadMoreMessages, fetch specific user messages etc.