Socket.IO logo


Realtime application framework (Node.JS server)
+ 1

What is Socket.IO?

It enables real-time bidirectional event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.
Socket.IO is a tool in the Realtime Backend / API category of a tech stack.
Socket.IO is an open source tool with GitHub stars and GitHub forks. Here’s a link to Socket.IO's open source repository on GitHub

Who uses Socket.IO?

1452 companies reportedly use Socket.IO in their tech stacks, including Tech Stack, Alibaba Travels, and Patreon.

10372 developers on StackShare have stated that they use Socket.IO.

Socket.IO Integrations

React, Flutter, Backbone.js, Angular, and Gatsby are some of the popular tools that integrate with Socket.IO. Here's a list of all 13 tools that integrate with Socket.IO.
Pros of Socket.IO
Event-based communication
Open source
Binary streaming
No internet dependency
Large community
Fallback to polling if WebSockets not supported
Push notification
Ease of access and setup
Decisions about Socket.IO

Here are some stack decisions, common use cases and reviews by companies and developers who chose Socket.IO in their tech stack.

Moghammad Sabre Khan
Needs advice

We (my team) are building an App where we want to have Bi-directional texting, Single Directional Picture, and audio transfer.

We are building all this using Flutter.

There will essentially be 3 apps, 2 Mobile-based (Android and iOS) and 1 Microsoft Based. We've built up most of the code already, and made a few major mistakes but fixed it(namely had no proper state management).

How things will work:

Person A has a Mobile app 1, Person A presses a button that sends a "communication request" into a Pool of requests. Person B on Desktop App chooses a "communication request" from the pool, and engages in Bi-directional texting with Person A. Person B also opens communication with Person C who is on Mobile app 2, and they engage in Bi-directional texting. Person C will be notified of communication requests through Push Notifications.

So far we've been using Socket.IO, however, I'm starting to think that's not the best.

A problem we've encountered so far is that Person A(Mobile App 1 User), is the person who sends a "communication request" into the "Communication Pool". The Mobile App 1 User, can "cancel" the communication at any point in time. When they do that, I would like for a notification to be sent to Person B, the Desktop User, For them to pick up another communication request.

I am not sure how this should be done however, should it be done in the Back-end, then how does the Front-end get notified of the change?

Any advice on which to choose?

See more
Needs advice

My web app will use redisJSON and/or MongoDB. I need my app to have real-time functions. I don't want to run my Next.js app with a dev server on the node. I want to use vercel's hosting with static side generation only. Do I use pusher or Socket.IO? Or maybe some tool I don't know about.

See more
Bruno Diaz
Needs advice

Hello guys, my team is looking for some stack pre-build to implement a real-time chat. Meanwhile, we had built a little infrastructure with Node.js, PHP/JavaScript, and Socket.IO, and it works fine, but we want to evolve. Thanks!

See more
Needs advice

I am trying to replace Socket.IO with PubNub. Provide the way to do it.

See more
Needs advice

We are starting to work on a web-based platform aiming to connect artists (clients) and professional freelancers (service providers). In-app, timeline-based, real-time communication between users (& storing it), file transfers, and push notifications are essential core features. We are considering using Node.js, ExpressJS, React, MongoDB stack with Socket.IO & Apollo, or maybe using Real-Time Database and functionalities of Firebase.

See more
Needs advice
Amazon ChimeAmazon Chime

Hello. So, I wanted to make a decision on whether to use WebRTC or Amazon Chime for a conference call (meeting). My plan is to build an app with features like video broadcasting, and the ability for all the participants to talk and chat. I have used Agora's web SDK for video broadcasting, and Socket.IO for chat features. As I read the comparison between Amazon Chime and WebRTC, it further intrigues me on what I should use given my scenario? Is there any way that so many related technologies could be a hindrance to the other? Any advice would be appreciated. Thanks. Ritwik Neema

See more

Blog Posts

Socket.IO's Features

  • Real-time analytics - Push data to clients that gets represented as real-time counters, charts or logs.
  • Binary streaming - Starting in 1.0, it's possible to send any blob back and forth: image, audio, video.
  • Instant messaging and chat - Socket.IO's "Hello world" is a chat app in just a few lines of code.
  • Document collaboration - Allow users to concurrently edit a document and see each other's changes.

Socket.IO Alternatives & Comparisons

What are some alternatives to Socket.IO?
SignalR allows bi-directional communication between server and client. Servers can now push content to connected clients instantly as it becomes available. SignalR supports Web Sockets, and falls back to other compatible techniques for older browsers. SignalR includes APIs for connection management (for instance, connect and disconnect events), grouping connections, and authorization.
SocketCluster is a fast, highly scalable HTTP + realtime server engine which lets you build multi-process realtime servers that make use of all CPU cores on a machine/instance. It removes the limitations of having to run your Node.js server as a single thread and makes your backend resilient by automatically recovering from worker crashes and aggregating errors into a central log.
PubNub makes it easy for you to add real-time capabilities to your apps, without worrying about the infrastructure. Build apps that allow your users to engage in real-time across mobile, browser, desktop and server.
Pusher is the category leader in delightful APIs for app developers building communication and collaboration features.
Express is a minimal and flexible node.js web application framework, providing a robust set of features for building single and multi-page, and hybrid web applications.
See all alternatives

Socket.IO's Followers
10314 developers follow Socket.IO to keep up with related blogs and decisions.