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server-events-nodejs\nA library for setting up server-sent events in Node.js. This library was inspired by work done by [\nDino Paskvan](https://www.github.com/dpskvn) on [express-sse](https://www.github.com/dpskvn/express-sse)\n\n## Install\n\n\u003enpm\n\n`npm install server-events-nodejs --save`\n\n\u003eyarn\n\n`yarn add server-events-nodejs`\n\n## Usage\n\n```js\n\nconst { Source, EventStream } = require('server-events-nodejs');\n\nconst express = require('express');\nconst cuid = require('cuid');\nconst port = \"8080\";\n\nconst source = new Source(cuid);\nconst app = express();\n\napp.listen(port, () =\u003e {\n  console.log('Server ready!');\n});\n\napp.use(\n  EventStream.init(source, { \n    no_ids: false, // if you need id: key/value (from the cuid lib) as part of the text-stream response - set to 'true'\n    pad_for_ie: false, // if the HTTP request is from an IE 8/9 browser - set to 'true'\n    prefered_event_name: 'update', // if you need event: key/value (here set to 'update')  as part of the text-stream resposne - set here to whatever you like\n    prefer_event_name: true // enforce the prefered event name to be used in the text-stream response\n  })\n);\n\napp.get('/notifications', function(req){\n    console.log('headers: ', req.headers);\n\n    // send comment: '!this is a comment!'\n    // send with event name: 'update'\n    // send with retry: 4500 (4.5 seconds)\n    source.send({\n            ids: [ '123', '456' ],\n            timestamp: Date.now()\n      }, \n      '!this is a comment!', // comment\n      'update', // event\n      4500 // retry\n    );\n    \n});\n\n```\n\n\u003eThen, you need to setup the front-end accordingly\n\n```js\n\nconst evtSource = new EventSource('http://localhost:8080/notifications');\n\nevtSource.addEventListener('open', function(e) {\n  console.log(\"connection is open!\");\n}, false);\n\nevtSource.addEventListener('error', function(e) {\n  console.error(e);\n  evtSource.close();\n})\n\nevtSource.addEventListener('update', function(e) {\n  console.log(\"message: \", JSON.parse(e.data));\n}, false);\n\n/* - logs to console -\n\n  connection is open!\n\n  message: {\n    \"ids\": [\n      \"123\",\n      \"456\"\n    ],\n    \"timestamp\": 1608970168797\n  }\n  \n*/\n```\n\n## License\nMIT\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fisocroft%2Fssenode","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fisocroft%2Fssenode","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fisocroft%2Fssenode/lists"}