Technologies Used

The Backend process of React Native Taxi App Backend are built using the core components of Node, Express, MongoDB, SocketIO.
Taxi App has also been constantly incorporating various other latest technologies.

Node JS

Node JS is a packaged compilation of Google’s V8 JavaScript engine, the libuv platform abstraction layer, and a core library, which is itself primarily written in JavaScript. Node JS shines in real-time web applications employing push technology over websockets. The main principle of Node JS: use non-blocking, event-driven I/O to remain lightweight and efficient in the face of data-intensive real-time applications that run across distributed devices. It replaces the traditional request-response paradigm with a fast, two-way communication model. It is asynchronous without the use of threads, it is not memory-intensive. Node JS websockets run on TCP, not HTTP, so low-overhead client-server communication is enabled in both directions.
Ideally, if you are writing a mobile app, you want to cover all the bases – iOS, Android and Windows – in order to obtain maximum market share or to grant your mobile workforce flexibility in device choice. A straightforward way to accomplish that is to write all the app’s logic in Node JS and place it on the backend. The user interface then runs on the mobile device under another language.

Express JS

Express JS is server-side and mobile application framework, written in JavaScript. It builds single-page, multi-page, and hybrid mobile and web apps; Common back-end functions for web applications; APIs.
Express JS is a prebuilt Node JS framework that can help you in creating server-side web applications faster and smarter. Simplicity, minimalism, flexibility, scalability are some of its characteristics and since it is made in Node JS itself, it inherited its performance as well.
In short, Express JS did for Node JS what Bootstrap did for HTML/CSS and responsive web design. It made coding in Node JS a piece of cake and gave programmers some additional features to extend their server-side coding. Express JS is hands down the most famous Node JS framework - so much so that when most people talk about Node JS they surely mean Node JS + Express JS.

MongoDB

MongoDB is a document-oriented database designed with both scalability and developer agility in mind. MongoDB's ability to store JavaScript objects natively saves time and processing power. Rather than storing your data in tables and rows as you would with a relational database, in MongoDB you store JSON-like documents with dynamic schemas. Instead of a domain-specific language like SQL, MongoDB utilizes a simple JavaScript interface for querying. Looking up a document is as simple as passing a JavaScript object that partially describes the search target.

SocketIO

Socket.IO is an event-based bi-directional communication layer for realtime web applications. It abstracts many transports, including AJAX long-polling and WebSockets, into a single API. It allows developers to send and receive data without worrying about cross-browser compatibility.
Socket.IO provides both server-side and client-side components with similar APIs.

Since both the server and client's Socket object act as EventEmitters, you can emit and listen for events in a bi-directional manner.

Passport JS

Passport is an authentication middleware for Node JS. Extremely flexible and modular, Passport can be unobtrusively dropped in to any Express-based application. Passport recognizes that each application has unique authentication requirements. Authentication mechanisms, known as strategies, are packaged as individual modules. Applications can choose which strategies to employ, without creating unnecessary dependencies.