What is Socket.IO and how it works?

What is Socket.IO and how it works?

Socket.IO is a JavaScript library that helps improving work with WebSockets. It consists of two parts – server part (for Node. JS) and clients part (for web browsers). Socket.IO allows to use additional features such as sending data to large number of sockets at the same time (broadcasting) or storing the data.

What is the difference between Socket.IO and socket IO client?

1 Answer. socket-io. client is the code for the client-side implementation of socket.io. That code may be used either by a browser client or by a server process that is initiating a socket.io connection to some other server (thus playing the client-side role in a socket.io connection).

What is Socket.IO file?

Socket. io-file (2.0. 31) is a node module for uploading files via the Socket.io module. Client and project aside, the upload functionality of socket.

What is Socket on and Socket emit?

emit – This method is responsible for sending messages. socket. on – This method is responsible for listening for incoming messages.

What is Socket.IO Redis?

The socket. io-redis plugin uses the pub/sub client of the redis server to connect multiple socket.io instances. download and install a redis server from https://redis.io. add the redis plugin to your socket.io instances: var express = require(‘express’); var app = express(); var server = require(‘http’).

How does Socket.IO JS work?

Socket.IO allows bi-directional communication between client and server. Bi-directional communications are enabled when a client has Socket.IO in the browser, and a server has also integrated the Socket.IO package. To establish the connection, and to exchange data between client and server, Socket.IO uses Engine.IO.

Is Socket.IO different from WebSocket?

Key Differences between WebSocket and socket.io It provides the Connection over TCP, while Socket.io is a library to abstract the WebSocket connections. WebSocket doesn’t have fallback options, while Socket.io supports fallback. WebSocket is the technology, while Socket.io is a library for WebSockets.

Is Socket.IO same as WebSocket?

Socket.IO is NOT a WebSocket implementation. That is why a WebSocket client will not be able to successfully connect to a Socket.IO server, and a Socket.IO client will not be able to connect to a WebSocket server either.

What is Socket.IO adapter?

An Adapter is a server-side component which is responsible for broadcasting events to all or a subset of clients. When scaling to multiple Socket.IO servers, you will need to replace the default in-memory adapter by another implementation, so the events are properly routed to all clients.

Does Socket.IO use WebSocket?

Although Socket.IO indeed uses WebSocket as a transport when possible, it adds additional metadata to each packet. That is why a WebSocket client will not be able to successfully connect to a Socket.IO server, and a Socket.IO client will not be able to connect to a plain WebSocket server either.

What is socket Io?

Socket.IO. Socket.IO is a JavaScript library for realtime web applications. It enables realtime, bi-directional communication between web clients and servers. It has two parts: a client-side library that runs in the browser, and a server-side library for Node.js. Both components have a nearly identical API.

How to check Node.js version?

1) Open the terminal window on your mac system as shown below. Terminal is an appilcation on the Mac system. 2) Enter the command ‘node -v’ without the quotes on the Mac terminal window as shown below. Node Version Command on the Mac Terminal Window 3) Press the enter key to display the current version of Node.js installed on your Mac system as shown below. Note the version 8.4.0 displayed in the screenshot below.

How does Node JS work?

Node.js. is a system that uses event-driven programming to build scalable applications and network programs. Node Js is Single threaded Platform which uses non-blocking I/O calls and especially helpful for building web servers.

What is Node JS?

Node.js is an open-source, cross-platform JavaScript runtime environment used for executing JavaScript code outside of a web browser. Node.js is a great web framework for beginners because it works great for data-intensive applications, like streaming and real-time apps, and Node.js makes it easy to start building the back-end.