> For the complete documentation index, see [llms.txt](https://junwoo45.gitbook.io/learn-rxjs-korean/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://junwoo45.gitbook.io/learn-rxjs-korean/learn-rxjs/recipes-1/error_handling/retry.md).

# retry

#### signature: `retry(number: number): Observable`

## Retry an observable sequence a specific number of times should an error occur.

:bulb: Useful for retrying HTTP requests!

:bulb: If you only want to retry in certain cases, check out [`retryWhen`](/learn-rxjs-korean/learn-rxjs/recipes-1/error_handling/retrywhen.md)!

:bulb: For non error cases check out [`repeat`](/learn-rxjs-korean/learn-rxjs/recipes-1/utility/repeat.md)!

### Examples

**Example 1: Retry 2 times on error**

( [StackBlitz](https://stackblitz.com/edit/typescript-jpjcpg?file=index.ts\&devtoolsheight=100) | [jsBin](http://jsbin.com/yovacuxuqa/1/edit?js,console) | [jsFiddle](https://jsfiddle.net/btroncone/hg7z16bo/) )

```javascript
// RxJS v6+
import { interval, of, throwError } from 'rxjs';
import { mergeMap, retry } from 'rxjs/operators';

//emit value every 1s
const source = interval(1000);
const example = source.pipe(
  mergeMap(val => {
    //throw error for demonstration
    if (val > 5) {
      return throwError('Error!');
    }
    return of(val);
  }),
  //retry 2 times on error
  retry(2)
);
/*
  output:
  0..1..2..3..4..5..
  0..1..2..3..4..5..
  0..1..2..3..4..5..
  "Error!: Retried 2 times then quit!"
*/
const subscribe = example.subscribe({
  next: val => console.log(val),
  error: val => console.log(`${val}: Retried 2 times then quit!`)
});
```

### Additional Resources

* [retry](https://rxjs.dev/api/operators/retry)

  :newspaper: - Official docs
* [Error handling operator: retry and retryWhen](https://egghead.io/lessons/rxjs-error-handling-operator-retry-and-retrywhen?course=rxjs-beyond-the-basics-operators-in-depth)

  :video\_camera: :dollar: - André Staltz

> :file\_folder: Source Code: <https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/retry.ts>