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Web Sockets

WebSockets in JavaScript enable real-time, bidirectional communication between clients and servers, allowing for instant data updates in interactive web applications. They operate over a single TCP connection and utilize a specific protocol (ws:// or wss://) for communication. Key functionalities include establishing connections, handling events, sending data, and implementing security measures to prevent vulnerabilities.

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mariano fernandez
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41 views10 pages

Web Sockets

WebSockets in JavaScript enable real-time, bidirectional communication between clients and servers, allowing for instant data updates in interactive web applications. They operate over a single TCP connection and utilize a specific protocol (ws:// or wss://) for communication. Key functionalities include establishing connections, handling events, sending data, and implementing security measures to prevent vulnerabilities.

Uploaded by

mariano fernandez
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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WebSockets

in JavaScript
WebSockets in JavaScript allow for
real-time, bidirectional
communication between a client
(usually a web browser) and a
server.

They are particularly useful for building


interactive web applications that require
instant data updates.
Understanding
WebSockets
WebSockets provide a full-duplex
communication channel over a single TCP
connection.

Unlike HTTP, WebSockets enable both the


client and server to send messages to each
other at any time without waiting for a
request from the client.

WebSockets use a protocol that starts with


ws:/ / (unencrypted) or wss:/ / (encrypted)
instead of http:// or https://
Creating a WebSocket
Connection
To establish a WebSocket connection in
JavaScript, create a new WebSocket
object, passing the WebSocket server
URL as a parameter.
WebSocket Events
WebSocket objects emit various events to
handle different stages of the connection.

open: Triggered when the connection is


successfully established
error: Triggered when an error occurs

close: Fired when the connection is closed


Sending Data
To send data to the server, use the send
method of the WebSocket object. Data
can be a string, ArrayBuffer, or Blob.

Closing the Connection


To close the WebSocket connection, call
the close method on the WebSocket
object.
Server-Side WebSocket
Implementation
On the server side, you need to
implement a WebSocket server that
listens for WebSocket connections and
handles messages from clients. Popular
libraries for this purpose include ws for
Node.js and libraries for various languages
like Python, Ruby, and Java.

Error Handling
Be sure to handle errors gracefully by
listening for the error event and providing
appropriate feedback to the user.
Security Considerations
When using WebSockets, consider security
measures like encrypting the connection
using wss: //, implementing
authentication, and validating incoming
messages to prevent vulnerabilities like
WebSocket- based attacks.

Use Cases
WebSockets are suitable for real-time
chat applications, online gaming, live
notifications, collaborative tools, and any
scenario where immediate data updates
are required.
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