Stream Catalog

The key to unlocking the value within data in motion and increasing productivity across an organization is a self-service tool for data discovery.

Available through both the Confluent Cloud UI and API, stream catalog allows users across teams to collaborate within a centralized, organized library designed for sharing, finding, and understanding the data needed to drive their projects forward quickly and efficiently. It’s like a digital library for data in motion allowing any user, experienced with Kafka or not, to search for what they need, find what’s already been built, and put it to use right away.

With classifications, teams can constantly increase the value of the business’s stream catalog by adding contextual details to data; for example, by labeling schema fields as “PII” (personal identifiable information) or “Sensitive”.

Searching Data and Schemas

Stream catalog in Confluent Cloud centralizes all schemas-related metadata and makes it available for discovery via the global search bar. In particular, with regard to schemas you can search for:

  • Schema subject name
  • Schema record name
  • Schema field name

Search with Filters

Click See all.. or hit return on your initial search results to view a more detailed list, with an option apply more filters.

This view shows “All Results” for a search on stocks.


You can filter this further by selecting an entity on the left menu; for example, “Schemas”.


Also, you can use the filters across the top to filter by “Environment”, “Tag”, or “Entities”.

This example narrows the search result based on entity type to show only schema subject names that include stocks.


This example filters on schema subjects, records, and fields in the demos environment that are tagged with my_stocks.


You can change the search on this detailed list view to search for other names of a selected entity type. For example, if you worked through the steps in the Quick Start to create a schema for the employees topic, search for employees in schemas. (Make sure you clear any other filters like tags that may not match the employees schema.)


Tagging Data and Schemas

Stream catalog features enables entity tagging. Tags are searchable like any other entity.

A fundamental aspect of governance is the ability to organize data based on a shared vocabulary, including multiple concepts and categories. Confluent Cloud now provides the option to create and apply tags to schemas and fine-grained entities like data records and fields. On this version of Confluent Cloud, you can:

  • Create instances of provided tags (Public, Private, Sensitive, PII) and custom (“free form”) tags
  • Associate tags with schema versions, records, and fields
  • Apply multiple tags to a single field, record, or schema version

Create tags

To create a tag:

  1. Navigate to the Schema Registry tab on the settings for a selected Environment.

  2. Click View & manage tags.

  3. Click Create tag, select either free-form or commonly used tags.

    • If you chose commonly used tags, select one or more tags that you want to create. (PII, which is personally identifiable information, Sensitive, Private, Public)
    • If you chose free-form, provide a tag name and optional description. Tag names must start with an alphabetic character, and can then include alpha characters, numbers and underscores.

    When the name and description is properly filled in, the Create button is active. Click Create to create the tag with the current name and description.

  4. View available tags.

    After a tag is created, it shows in the list under Tag management.


Apply tags

To apply a tag:

  1. Navigate to a schema, data record, or data field for which you want to apply a tag.

    There are a few of different ways to do this:

    • From the Search bar, start typing the name of a schema, record, field, or topic where you want to apply a tag.
    • From the same environment level view on the Schema Registry tab, click View and manage schemas and select a schema from the list.
    • From within a cluster, navigate to a topic, then click the Schema tab for that topic.
  2. On the Schemas tab for a topic, you can add tags as follows.

    • To add tags to selected schema version as a whole, select Add tags to this version on the right panel, and select a tag from the drop-down list of available tags.
    • To add tags to a selected record or field, expand the tree view of the schema (the default view), click the plus icon image_reference next to the entity, and select a tag from the drop-down list of available tags.
  3. View applied tags.

    Applied tags show next to the schema version, records, and fields with which they are associated.

Remove a tag from a schema version or data field

To remove a previously applied tag from an entity:

  1. Navigate to the schema that includes the tag.
  2. Click the x on the applied tag.

Edit a tag

To edit a tag description:

  1. Navigate to the Schema Registry tab on the settings for a selected Environment.
  2. Click View & manage tags.
  3. Select the tag you want to edit from the Tag management list.
  4. Click the edit icon next to the description, edit, and click Save.


You cannot edit the name of an existing tag, only its description. To rename a tag, remove it from any entities to which it is applied, delete the tag, and create a new one.

Delete a tag

If you want to delete a tag, first make sure that the tag is not currently applied to any entities. If the tag is in use, the delete operation will fail.

To delete a tag from an environment:

  1. Navigate to the Schema Registry tab on the settings for a selected Environment.
  2. Click View & manage tags.
  3. Select the tag you want to delete from the Tag management list.
  4. Click the trashcan icon in the upper right.
    • If the tag is in use (applied to one or more entities), you will get a warning and the tag will not be deleted.
    • If the tag is not in use, it is deleted.

API Documentation

The stream catalog API allows you to create, retrieve, update, and delete catalog entities. To learn more, see the Confluent Cloud CATALOG API (V1).


The catalog API provides search capabilities for schema entity types (subjects, records, and fields) only. The API currently does not include search capabilities for other entity types like topics, connectors, and so forth; whereas, the global search in the Confluent Cloud UI searches all entity types.