{% include anchor.html title="Sync a database" hash="sync" %} 

{% highlight js %}
var sync = PouchDB.sync(src, target, [options])
{% endhighlight %}

Sync data from `src` to `target` and `target` to `src`. This is a convenience method for bidirectional data replication.

In other words, this code:

{% highlight js %}
PouchDB.replicate('mydb', 'http://localhost:5984/mydb');
PouchDB.replicate('http://localhost:5984/mydb', 'mydb');
{% endhighlight %}


is equivalent to this code:

{% highlight js %}
PouchDB.sync('mydb', 'http://localhost:5984/mydb');
{% endhighlight %}


### Options

Please refer to [replicate()](api.html#replication) for documentation on options, as `sync()` is just a convenience method that entails bidirectional replication.

#### Example Usage:
{% highlight js %}
var sync = PouchDB.sync('mydb', 'http://localhost:5984/mydb', {
  live: true,
  retry: true
}).on('change', function (info) {
  // handle change
}).on('paused', function () {
  // replication paused (e.g. user went offline)
}).on('active', function () {
  // replicate resumed (e.g. user went back online)
}).on('denied', function (info) {
  // a document failed to replicate, e.g. due to permissions
}).on('complete', function (info) {
  // handle complete
}).on('error', function (err) {
  // handle error
});

sync.cancel(); // whenever you want to cancel
{% endhighlight %}

There is also a shorthand for syncing given existing PouchDB objects. This behaves the same as `PouchDB.sync()`:

{% highlight js %}
db.sync(remoteDB, [options]);
{% endhighlight %}

For any further details, please refer to [replicate()](api.html#replication).