Weaviate

Bundles contain custom components that support specific third-party integrations with Langflow.

This page describes the components that are available in the Weaviate bundle.

Weaviate vector store

The Weaviate component reads and writes to Weaviate vector stores using an instance of Weaviate vector store.

About vector store instances

Because Langflow is based on LangChain, vector store components use an instance of LangChain vector store to drive the underlying read and write functions. These instances are provider-specific and configured according to the component's parameters, such as the connection string, index name, and schema.

In component code, this is often instantiated as vector_store, but some vector store components use a different name, such as the provider name.

Some LangChain classes don't expose all possible options as component parameters. Depending on the provider, these options might use default values or allow modification through environment variables, if they are supported in Langflow. For information about specific options, see the LangChain API reference and vector store provider's documentation.

If you use a vector store component to query your vector database, it produces search results that you can pass to downstream components in your flow as a list of Data objects or a tabular DataFrame. If both types are supported, you can set the format near the vector store component's output port in the visual editor.

tip

For a tutorial using a vector database in a flow, see Create a vector RAG chatbot.

Weaviate parameters

You can inspect a vector store component's parameters to learn more about the inputs it accepts, the features it supports, and how to configure it.

Some parameters are hidden by default in the visual editor. You can modify all parameters through the Controls in the component's header menu.

Some parameters are conditional, and they are only available after you set other parameters or select specific options for other parameters. Conditional parameters may not be visible on the Controls pane until you set the required dependencies.

For information about accepted values and functionality, see the Weaviate documentation or inspect component code.

Name	Type	Description
weaviate_url	String	Input parameter. The default instance URL.
api_key	SecretString	Input parameter. The optional API key for authentication.
index_name	String	Input parameter. The optional index name.
text_key	String	Input parameter. The default text extraction key.
input	Data or DataFrame	Input parameter. The document or record.
cache_vector_store	Cache Vector Store	Input parameter. If true, the component caches the vector store in memory for faster reads. Default: Enabled (true).
embedding	Embeddings	Input parameter. Connect an embedding model component.
number_of_results	Integer	Input parameter. The number of search results to return. Default: 4.
search_by_text	Boolean	Input parameter. Indicates whether to search by text. Default: Disabled (false).