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*   [Providers](/v0.1/docs/integrations/platforms/)
    
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        *   [Astra DB Chat Memory](/v0.1/docs/integrations/chat_memory/astradb/)
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        *   [Xata Chat Memory](/v0.1/docs/integrations/chat_memory/xata/)
        *   [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/)
*   Upstash Redis-Backed Chat Memory

Upstash Redis-Backed Chat Memory
================================

Because Upstash Redis works via a REST API, you can use this with [Vercel Edge](https://vercel.com/docs/concepts/functions/edge-functions/edge-runtime), [Cloudflare Workers](https://developers.cloudflare.com/workers/) and other Serverless environments. Based on Redis-Backed 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 an Upstash [Redis](https://redis.io/) instance.

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

You will need to install [@upstash/redis](https://github.com/upstash/upstash-redis) in your project:

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 @langchain/openai @upstash/redis @langchain/community

    yarn add @langchain/openai @upstash/redis @langchain/community

    pnpm add @langchain/openai @upstash/redis @langchain/community

You will also need an Upstash Account and a Redis database to connect to. See instructions on [Upstash Docs](https://docs.upstash.com/redis) on how to create a HTTP client.

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

Each chat history session stored in Redis must have a unique id. You can provide an optional `sessionTTL` to make sessions expire after a give number of seconds. The `config` parameter is passed directly into the `new Redis()` constructor of [@upstash/redis](https://docs.upstash.com/redis/sdks/javascriptsdk/overview), and takes all the same arguments.

    import { BufferMemory } from "langchain/memory";import { UpstashRedisChatMessageHistory } from "@langchain/community/stores/message/upstash_redis";import { ChatOpenAI } from "@langchain/openai";import { ConversationChain } from "langchain/chains";const memory = new BufferMemory({  chatHistory: new UpstashRedisChatMessageHistory({    sessionId: new Date().toISOString(), // Or some other unique identifier for the conversation    sessionTTL: 300, // 5 minutes, omit this parameter to make sessions never expire    config: {      url: "https://ADD_YOURS_HERE.upstash.io", // Override with your own instance's URL      token: "********", // Override with your own instance's token    },  }),});const model = new ChatOpenAI({  model: "gpt-3.5-turbo",  temperature: 0,});const chain = new ConversationChain({ llm: model, memory });const res1 = await chain.invoke({ input: "Hi! I'm Jim." });console.log({ res1 });/*{  res1: {    text: "Hello Jim! It's nice to meet you. My name is AI. How may 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 Jim."  }}*/

#### API Reference:

*   [BufferMemory](https://api.js.langchain.com/classes/langchain_memory.BufferMemory.html) from `langchain/memory`
*   [UpstashRedisChatMessageHistory](https://api.js.langchain.com/classes/langchain_community_stores_message_upstash_redis.UpstashRedisChatMessageHistory.html) from `@langchain/community/stores/message/upstash_redis`
*   [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`

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

You can also directly pass in a previously created [@upstash/redis](https://docs.upstash.com/redis/sdks/javascriptsdk/overview) client instance:

    import { Redis } from "@upstash/redis";import { BufferMemory } from "langchain/memory";import { UpstashRedisChatMessageHistory } from "@langchain/community/stores/message/upstash_redis";import { ChatOpenAI } from "@langchain/openai";import { ConversationChain } from "langchain/chains";// Create your own Redis clientconst client = new Redis({  url: "https://ADD_YOURS_HERE.upstash.io",  token: "********",});const memory = new BufferMemory({  chatHistory: new UpstashRedisChatMessageHistory({    sessionId: new Date().toISOString(),    sessionTTL: 300,    client, // You can reuse your existing Redis client  }),});const model = new ChatOpenAI({  model: "gpt-3.5-turbo",  temperature: 0,});const chain = new ConversationChain({ llm: model, memory });const res1 = await chain.invoke({ input: "Hi! I'm Jim." });console.log({ res1 });/*{  res1: {    text: "Hello Jim! It's nice to meet you. My name is AI. How may 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 Jim."  }}*/

#### API Reference:

*   [BufferMemory](https://api.js.langchain.com/classes/langchain_memory.BufferMemory.html) from `langchain/memory`
*   [UpstashRedisChatMessageHistory](https://api.js.langchain.com/classes/langchain_community_stores_message_upstash_redis.UpstashRedisChatMessageHistory.html) from `@langchain/community/stores/message/upstash_redis`
*   [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`

* * *

#### Help us out by providing feedback on this documentation page:

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