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A capture is a catalog task which connects to an external data source, or endpoint and binds one or more of its resources, such as a database tables, to Flow collections. As documents become available for any of the bindings, Flow validates their schema and adds them to their bound collection.

Pull captures

Pull captures pull documents from an endpoint using a connector:

# A set of captures to include in the catalog.
# Optional, type: object
# The name of the capture.
# Endpoint defines how to connect to the source of the capture.
# Required, type: object
# This endpoint uses a connector provided as a Docker image.
# Docker image which implements the capture connector.
# File which provides the connector's required configuration.
# Configuration may also be presented inline.
config: path/to/connector-config.yaml

# Bindings define how collections are populated from the data source.
# A capture may bind multiple resources to different collections.
# Required, type: array
- # The target collection to capture into.
# This may be defined in a separate, imported catalog source file.
# Required, type: string
target: acmeCo/example/collection

# The resource is additional configuration required by the endpoint
# connector to identify and capture a specific endpoint resource.
# The structure and meaning of this configuration is defined by
# the specific connector.
# Required, type: object
stream: a-bucket/and-prefix
# syncMode should be set to incremental for all Estuary connectors
syncMode: incremental

- target: acmeCo/example/another-collection
stream: a-bucket/another-prefix
syncMode: incremental

Estuary sources

Estuary builds and maintains many real-time connectors for various technology systems, such as database change data capture (CDC) connectors.

See the source connector reference documentation.

Airbyte sources

Flow also natively supports Airbyte source connectors. These connectors tend to focus on SaaS APIs, and do not offer real-time streaming integrations. Flow runs the connector at regular intervals to capture updated documents.

A list of third-party connectors can be found on the Airbyte docker hub. You can use any item whose name begins with source-.


Flow offers a CLI tool flowctl discover --image connector/image:tag which provides a guided workflow for creating a correctly configured capture.

Push captures

Push captures expose an endpoint to which documents may be pushed using a supported ingestion protocol:


# The name of the capture.
# This endpoint is an ingestion.
ingest: {}

- # The target collection to capture into.
target: acmeCo/example/webhooks
# The resource configures the specific behavior of the ingestion endpoint.
name: webhooks

Push captures are under development. Estuary intends to offer Webhook, Websocket, and Kafka-compatible APIs for capturing into collections. Specification details are likely to exist.