express-sse-middleware

It's a Express middleware that simply and easily using Server Sent Events (SSE)

Installation

``
npm install express-sse-middleware
`

How to use

$3


`javascript
import express from 'express';
import { sseMiddleware } from 'express-sse-middleware';

app.use(sseMiddleware);
app.get('/path', (req, res) => {
const sse = res.sse(); // adding Response.sse() funciton

let count = 0;
setInterval(() => {
sse.send(String(count++));
}, 1000);

// sent incremented number every second.
// ↓
// data: 0
// data: 1
// data: ...

});

app.listen(3000);
`

$3


Prepared a simple event builder.
but params of send function is so simple that No need to use.
`ts
let count = 0;
const builder = new EventBuilder() // <- Builder instance is immutable.
.id('test_id')
.event('event_name');
setInterval(() => {
sse.send(builder.data(String(count++)).build());
}, 1000);

// ↓
// id: test_id
// event: event_name
// data: 0
//
// id: test_id
// event: event_name
// data: 1
``

Dependency

This middleware is not depend on anything.