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Copy file name to clipboardExpand all lines: src/connections/destinations/destination-filters.md
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Destination Filters allow you to control the data flowing into each specific destination, by conditionally preventing data from being sent to cloud-mode destinations. You can filter out entire events, or just specific fields in the properties, traits, or in the context of your events.
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Destination Filters allow you to control the data flowing into each specific destination by conditionally preventing data from being sent to cloud-mode destinations. You can filter out entire events, or just specific fields in the properties, traits, or in the context of your events.
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With Destination Filters, you can:
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### Destination Filtering Limitations
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- Destination Filters can only be applied to Cloud-mode ("server-side") streaming destinations. Device-mode destinations are not supported.
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- You cannot apply Destination Filters to Warehouses or S3 destinations.
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- Destination Filters can only be applied to Cloud-mode ("server-side") streaming destinations. Device-mode destinations aren't supported.
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- You can't apply Destination Filters to Warehouses or S3 destinations.
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- Each filter can only apply to one source-destination pair.
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If you have a compelling use case for these unsupported options, [contact us](https://segment.com/help/contact/).
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If you have a compelling use case for these unsupported options, [contact Segment](https://segment.com/help/contact/).
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## Create a Destination Filter
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To create a Destination Filter:
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1. Go to **Connections > Destinations** and select your destination.
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2. Click on the **Filters** tab of your destination.
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3. Click **+ New Filter**.
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4. Configure the rules for your filter.
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5.*(Optional)* Click **Load Sample Event** to test your filter to see if the event passes through your filter.
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6. Click **Next Step**.
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7. Name your filter and click the toggle to enable it.
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6. Click **Save**.
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## Destination Filters API
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The Destination Filters API provides even more power than the Destination
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The Destination Filters API provides more power than the Destination
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Filters settings in the Segment dashboard. You can create complex filters
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that are conditionally applied using Segment's "Filter Query Language" (FQL).
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The Destination Filters API offers four different types of filters:
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The Destination Filters API offers these 4 different types of filters:
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1.**drop_event**: Do not send matched event to the destination.
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2.**sample_event**: Send only a percentage of events through to the
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destination.
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3.**whitelist_fields**: Only send whitelisted properties to destination.
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4.**blocklist_fields**: Do not send blocklisted properties to destination.
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Filter | Details
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------ | -------
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`drop_event` | Don't send matched events to the destination.
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`sample_event` | Send only a percentage of events through to the destination.
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`whitelist_fields` | Only send whitelisted properties to the destination.
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`blocklist_fields` | Don't send blocklisted properties to the destination.
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Read more in the [Destination Filters API docs](https://reference.segmentapis.com/#6c12fbe8-9f84-4a6c-848e-76a2325cb3c5).
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Example: Remove email addresses from `context` and `properties`:
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Property-level whitelisting is available using our API. Use this to do things
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like only send certain traits you know have no PII to a destination, and block
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Property-level whitelisting is available using Segment's API. Use this to perform actions like only send certain traits you know have no PII to a destination, and block
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all other traits in the context or property fields.
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### Cleaner Data
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Example: only send events - only send track calls to Google Analytics:
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Example: Only send events - only send track calls to Google Analytics:
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### Remove Internal and Test Events From Production Tools
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Example: Do not send events when email contains `@segment.com`:
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Example: Don't send events when the email contains `@segment.com`:
[This video](https://www.youtube.com/watch?v=47dhAF1Hoco) shows an example of
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filtering events being sent to a destination based on the name of the event.
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filtering events sent to a destination based on the name of the event.
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## Important Notes
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**Conflicting settings**
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Some destinations offer settings that also allow you to filter data. For example, the Facebook App Events destination allows you to map `Screen` events to `Track` events. Because Destination Filters are evaluated and applied _before_ the Destination settings are applied, they can conflict with your settings.
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In the example in the video above, if you have a Destination Filter that only allows Track events _and_ you have the "Use Screen Events as Track Events" setting enabled, `Track` events are dropped, but `Screen` events are still processed and are transformed by the destination settings into a `Track` event - *after* the filters.
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In the example in the video above, if you have a Destination Filter that only allows Track events _and_ you have the **Use Screen Events as Track Events** setting enabled, `Track` events are drop, but `Screen` events still process, and the destination settings transform it into a `Track` event - *after* the filters.
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**Error handling**
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We make every effort to ensure that Destination Filters handle unexpected
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situations gracefully. For example, if you use the `contains()` FQL function on
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a field and that field is `null`, we return`false` instead of returning an error. If we can't reasonably infer your intent, we log an internal error, and drop the event. We default to this behavior to prevent sensitive information, for example from a PII filter, from getting through.
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Segment makes effort to ensure that Destination Filters handle unexpected
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situations. For example, if you use the `contains()` FQL function on
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a field and that field is `null`, Segment returns`false` instead of returning an error. If Segment can't reasonably infer your intent, Segment logs an internal error, and drops the event. Segment defaults to this behavior to prevent sensitive information, for example from a PII filter, from getting through.
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Errors are not exposed in the Event Deliverability tab of your Destination. For help diagnosing unexpectedly missing events when using Destination Filters, [contact us](https://segment.com/help/contact/).
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Errors aren't exposed in the Event Deliverability tab of your Destination. For help diagnosing unexpectedly missing events when using Destination Filters, [contact Segment](https://segment.com/help/contact/).
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## FAQ
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**Q: How does destination filters work with array properties?**
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Destination Filters can filter properties out of objects nested in an array. For
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example, you could filter out the `price` property of every object in an array at `properties.products`. You can also filter out an entire array from the payload. However, you cannot drop nested objects in an array, or filter
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properties out of a single object in an array.
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example, you could filter out the `price` property of every object in an array at `properties.products`. You can also filter out an entire array from the payload. However, you can't drop nested objects in an array, or filter properties out of a single object in an array.
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**Q: How many filters can I create?**
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You are currently limited to 10 filters per destination. If you need help
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consolidating filters or would like to discuss your use case, [contact us](https://segment.com/help/contact/)!
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You are limited to 10 filters per destination. If you need help
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consolidating filters or would like to discuss your use case, [contact Segment](https://segment.com/help/contact/)!
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**Q: When will you support warehouses?**
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If you want to filter out events from warehouses, the best way to do that today
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is with the existing Selective Sync feature.
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If you want to filter out events from warehouses, the best way to do that is with the existing Selective Sync feature.
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**Q: I don't see a "name" property at the top level of my events to filter on "event name"!**
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**Q: I don't see a "name" property at the top level of my events to filter on "event name".**
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Generally, only Track calls have "name" properties, which corresponds to the
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"Event" field in an event.
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**Q: How can I find out when new filters have been added or removed from a destination?**
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The Activity Feed shows the action, date, and user who performed the action when a Destination Filter is created, modified, enabled, disabled, or deleted. You can also subscribe to notifications for any of these changes in the
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Activity Feed settings page.
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The Activity Feed shows the action, date, and user who performed the action when a Destination Filter is created, modified, enabled, disabled, or deleted. You can also subscribe to notifications for any of these changes in the **Activity Feed** settings page.
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**Q: Why am I getting a permissions denied error when trying to save a filter?**
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Anyone with `read` access on the source can view and test filters, but only users with `write` access can edit filters.
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**Q: How can I test that my filter is working?**
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Use the Destination Filter tester (in the destination filter set up screens) to test if you are filtering out the right events. Filtered events still show up in the schema page, but are not counted in the Event Deliverability graphs.
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Use the Destination Filter tester (in the destination filter set up screens) to test if you are filtering out the right events. Filtered events still show up in the schema page, but aren't counted in the Event Deliverability graphs.
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