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sockjs

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sockjs

SockJS-node is a server counterpart of SockJS-client a JavaScript library that provides a WebSocket-like object in the browser. SockJS gives you a coherent, cross-browser, Javascript API which creates a low latency, full duplex, cross-domain communication

  • 0.3.24
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12M
increased by3.64%
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5
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Created

What is sockjs?

SockJS is a JavaScript library that provides a WebSocket-like object in environments where true WebSockets are not available or not fully supported. It is designed to work both on the client-side and server-side to enable seamless communication between the two. SockJS provides a consistent API and attempts to provide a low-latency, full duplex, cross-domain communication channel that can work even behind restrictive corporate proxies.

What are sockjs's main functionalities?

Server-side WebSocket emulation

This code sample demonstrates how to create a SockJS server that emulates a WebSocket. It listens for connections on the '/echo' path and simply echoes back any messages it receives.

const http = require('http');
const sockjs = require('sockjs');
const echo = sockjs.createServer({ prefix: '/echo' });
echo.on('connection', function(conn) {
  conn.on('data', function(message) {
    conn.write(message);
  });
});
const server = http.createServer();
echo.installHandlers(server, { prefix: '/echo' });
server.listen(9999, '0.0.0.0');

Client-side WebSocket emulation

This code sample shows how to create a SockJS client that connects to a SockJS server. It sends a message when the connection is opened and logs any messages it receives before closing the connection.

const SockJS = require('sockjs-client');
let sock = new SockJS('http://localhost:9999/echo');
sock.onopen = function() {
  console.log('open');
  sock.send('test');
};
sock.onmessage = function(e) {
  console.log('message', e.data);
  sock.close();
};
sock.onclose = function() {
  console.log('close');
};

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Package last updated on 03 Dec 2021

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