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# EventSource
Undici exposes a WHATWG spec-compliant implementation of [EventSource](https://developer.mozilla.org/en-US/docs/Web/API/EventSource)
for [Server-Sent Events](https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events).
## Instantiating EventSource
Undici exports a EventSource class. You can instantiate the EventSource as
follows:
```mjs
import { EventSource } from 'undici'
const evenSource = new EventSource('http://localhost:3000')
evenSource.onmessage = (event) => {
console.log(event.data)
}
```
More information about the EventSource API can be found on
[MDN](https://developer.mozilla.org/en-US/docs/Web/API/EventSource).
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