Viewing File: /usr/local/cpanel/3rdparty/share/promise/3.5.5/docs/docs/api/promise.onunhandledrejectionhandled.md

---
layout: api
id: promise.onunhandledrejectionhandled
title: Promise.onUnhandledRejectionHandled
---


[← Back To API Reference](/docs/api-reference.html)
<div class="api-code-section"><markdown>
##Promise.onUnhandledRejectionHandled

```js
Promise.onUnhandledRejectionHandled(function(Promise promise) handler) -> undefined
```


*Note: this hook is specific to the bluebird instance its called on, application developers should use [global rejection events](/docs/api/error-management-configuration.html#global-rejection-events)*

Add `handler` as the handler to call when a rejected promise that was reported as "possibly unhandled rejection" became handled.

Together with `onPossiblyUnhandledRejection` these hooks can be used to implement a debugger that will show a list
of unhandled promise rejections updated in real time as promises become handled.

For example:

```js
var unhandledPromises = [];
Promise.onPossiblyUnhandledRejection(function(reason, promise) {
    unhandledPromises.push(promise);
    //Update some debugger UI
});

Promise.onUnhandledRejectionHandled(function(promise) {
    var index = unhandledPromises.indexOf(promise);
    unhandledPromises.splice(index, 1);
    //Update the debugger UI
});
```
</markdown></div>

<div id="disqus_thread"></div>
<script type="text/javascript">
    var disqus_title = "Promise.onUnhandledRejectionHandled";
    var disqus_shortname = "bluebirdjs";
    var disqus_identifier = "disqus-id-promise.onunhandledrejectionhandled";
    
    (function() {
        var dsq = document.createElement("script"); dsq.type = "text/javascript"; dsq.async = true;
        dsq.src = "//" + disqus_shortname + ".disqus.com/embed.js";
        (document.getElementsByTagName("head")[0] || document.getElementsByTagName("body")[0]).appendChild(dsq);
    })();
</script>
<noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript" rel="nofollow">comments powered by Disqus.</a></noscript>