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io.js
io.js

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Socket.IO
Socket.IO

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io.js vs Socket.IO: What are the differences?

What is io.js? A friendly fork of Node.js with an open governance model. io.js is a JavaScript platform built on Chrome's V8 runtime. This project began as a fork of Joyent's Node.js and is compatible with the npm ecosystem.

What is Socket.IO? Realtime application framework (Node.JS server). Socket.IO enables real-time bidirectional event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

io.js can be classified as a tool in the "Frameworks (Full Stack)" category, while Socket.IO is grouped under "Realtime Backend / API".

"Compatible with NPM" is the primary reason why developers consider io.js over the competitors, whereas "Real-time" was stated as the key factor in picking Socket.IO.

Socket.IO is an open source tool with 46.9K GitHub stars and 8.54K GitHub forks. Here's a link to Socket.IO's open source repository on GitHub.

According to the StackShare community, Socket.IO has a broader approval, being mentioned in 561 company stacks & 397 developers stacks; compared to io.js, which is listed in 4 company stacks and 5 developer stacks.

- No public GitHub repository available -

What is io.js?

io.js is a JavaScript platform built on Chrome's V8 runtime. This project began as a fork of Joyent's Node.js and is compatible with the npm ecosystem.

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.
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    What are some alternatives to io.js and Socket.IO?
    Node.js
    Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.
    ASP.NET
    .NET is a developer platform made up of tools, programming languages, and libraries for building many different types of applications.
    Rails
    Rails is a web-application framework that includes everything needed to create database-backed web applications according to the Model-View-Controller (MVC) pattern.
    Django
    Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design.
    Laravel
    It is a web application framework with expressive, elegant syntax. It attempts to take the pain out of development by easing common tasks used in the majority of web projects, such as authentication, routing, sessions, and caching.
    See all alternatives
    Decisions about io.js and Socket.IO
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    Reviews of io.js and Socket.IO
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    How developers use io.js and Socket.IO
    Avatar of Tony Manso
    Tony Manso uses Socket.IOSocket.IO

    I use Socket.IO because using HTTP requests for a real-time multiplayer game just blows! Even with websockets, I had to scrunch the data being transmitted down to a bare minimum, and do some cheap compression tricks so that I can send data in JSON format. Otherwise, I would have to resort to sending binary data. I may end up doing that anyway when the time comes that I need to scale.

    How do I use it? Each client opens a socket connection at startup. The server keeps track of these connections, and sends each client the visible portion of the Playfield repeatedly. The clients render this information, while sending requests and commands to the server (join,turn,fire,thrust,bomb,viewport change,etc.) in response to the player's actions. The server uses that to make adjustments to the player's ship on the Playfield.

    Avatar of Trello
    Trello uses Socket.IOSocket.IO

    Where we have browser support (recent Chrome, Firefox, and Safari), we make a WebSocket connection so that the server can push changes made by other people down to browsers listening on the appropriate channels. We use a modified version* of the Socket.io client and server libraries that allows us to keep many thousands of open WebSockets on each of our servers at very little cost in terms of CPU or memory usage. So when anything happens to a board you’re watching, that action is published to our server processes and propagated to your watching browser with very minimal latency, usually well under a second.

    Avatar of Kent Steiner
    Kent Steiner uses Socket.IOSocket.IO

    Socket.IO has a decent community footprint, including integrations with popular JS frameworks, and has fallbacks to maintain an app's services if websockets are not available for some reason. Websockets are an important factor in most of the web-facing apps I build, to provide asynchronous two-way communication between the app and whatever server or data source it is connected to.

    Avatar of Andrew Gatenby
    Andrew Gatenby uses Socket.IOSocket.IO

    Another one that we're not using, yet. But have realtime data updates within our applications and the central API will be a great bit of functionality that gives our clients more control and keep them informed of changes and updates in their stores, in real time.

    Avatar of AngeloR
    AngeloR uses Socket.IOSocket.IO

    Socket.io is used as our current multiplayer engine. The existing engine is very simplistic and only utilizes the websocket+http fallback transports and serves as a generic world/zone/screen grouping mechanism for displaying users to each other.

    How much does io.js cost?
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