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*   [Providers](/v0.1/docs/integrations/platforms/)
    
    *   [Providers](/v0.1/docs/integrations/platforms/)
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    *   [Chat Memory](/v0.1/docs/integrations/chat_memory/)
        
        *   [Astra DB Chat Memory](/v0.1/docs/integrations/chat_memory/astradb/)
        *   [Cassandra Chat Memory](/v0.1/docs/integrations/chat_memory/cassandra/)
        *   [Cloudflare D1-Backed Chat Memory](/v0.1/docs/integrations/chat_memory/cloudflare_d1/)
        *   [Convex Chat Memory](/v0.1/docs/integrations/chat_memory/convex/)
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        *   [Zep Memory](/v0.1/docs/integrations/chat_memory/zep_memory/)
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*   [](/v0.1/)
*   [Components](/v0.1/docs/integrations/components/)
*   [Chat Memory](/v0.1/docs/integrations/chat_memory/)
*   Cassandra Chat Memory

Cassandra Chat Memory
=====================

For longer-term persistence across chat sessions, you can swap out the default in-memory `chatHistory` that backs chat memory classes like `BufferMemory` for a Cassandra cluster.

Setup[​](#setup "Direct link to Setup")
---------------------------------------

First, install the Cassandra Node.js driver:

tip

See [this section for general instructions on installing integration packages](/v0.1/docs/get_started/installation/#installing-integration-packages).

*   npm
*   Yarn
*   pnpm

    npm install cassandra-driver @langchain/openai @langchain/community

    yarn add cassandra-driver @langchain/openai @langchain/community

    pnpm add cassandra-driver @langchain/openai @langchain/community

Depending on your database providers, the specifics of how to connect to the database will vary. We will create a document `configConnection` which will be used as part of the vector store configuration.

### Apache Cassandra®[​](#apache-cassandra "Direct link to Apache Cassandra®")

    const configConnection = {  contactPoints: ['h1', 'h2'],  localDataCenter: 'datacenter1',  credentials: {    username: <...> as string,    password: <...> as string,  },};

### Astra DB[​](#astra-db "Direct link to Astra DB")

Astra DB is a cloud-native Cassandra-as-a-Service platform.

1.  Create an [Astra DB account](https://astra.datastax.com/register).
2.  Create a [vector enabled database](https://astra.datastax.com/createDatabase).
3.  Create a [token](https://docs.datastax.com/en/astra/docs/manage-application-tokens.html) for your database.

    const configConnection = {  serviceProviderArgs: {    astra: {      token: <...> as string,      endpoint: <...> as string,    },  },};

Instead of `endpoint:`, you many provide property `datacenterID:` and optionally `regionName:`.

Usage[​](#usage "Direct link to Usage")
---------------------------------------

    import { BufferMemory } from "langchain/memory";import { CassandraChatMessageHistory } from "@langchain/community/stores/message/cassandra";import { ChatOpenAI } from "@langchain/openai";import { ConversationChain } from "langchain/chains";// The example below uses Astra DB, but you can use any Cassandra connectionconst configConnection = {  serviceProviderArgs: {    astra: {      token: "<your Astra Token>" as string,      endpoint: "<your Astra Endpoint>" as string,    },  },};const memory = new BufferMemory({  chatHistory: new CassandraChatMessageHistory({    ...configConnection,    keyspace: "langchain",    table: "message_history",    sessionId: "<some unique session identifier>",  }),});const model = new ChatOpenAI();const chain = new ConversationChain({ llm: model, memory });const res1 = await chain.invoke({ input: "Hi! I'm Jonathan." });console.log({ res1 });/*{  res1: {    text: "Hello Jonathan! How can I assist you today?"  }}*/const res2 = await chain.invoke({ input: "What did I just say my name was?" });console.log({ res2 });/*{  res1: {    text: "You said your name was Jonathan."  }}*/

#### API Reference:

*   [BufferMemory](https://api.js.langchain.com/classes/langchain_memory.BufferMemory.html) from `langchain/memory`
*   [CassandraChatMessageHistory](https://api.js.langchain.com/classes/langchain_community_stores_message_cassandra.CassandraChatMessageHistory.html) from `@langchain/community/stores/message/cassandra`
*   [ChatOpenAI](https://api.js.langchain.com/classes/langchain_openai.ChatOpenAI.html) from `@langchain/openai`
*   [ConversationChain](https://api.js.langchain.com/classes/langchain_chains.ConversationChain.html) from `langchain/chains`

* * *

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