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*   [Memory](/v0.1/docs/modules/memory/)
*   Chat Message History

Chat Message History
====================

info

Head to [Integrations](/v0.1/docs/integrations/chat_memory/) for documentation on built-in chat message history integrations with 3rd-party databases and tools.

One of the core utility classes underpinning most (if not all) memory modules is the `ChatMessageHistory` class. This is a wrapper that provides convenience methods for saving `HumanMessage`s, `AIMessage`s, and other chat messages and then fetching them.

You may want to use this class directly if you are managing memory outside of a chain.

Below is a basic example with an in-memory, ephemeral message store:

    import { HumanMessage, AIMessage } from "@langchain/core/messages";import { ChatMessageHistory } from "langchain/stores/message/in_memory";const history = new ChatMessageHistory();await history.addMessage(new HumanMessage("hi"));await history.addMessage(new AIMessage("what is up?"));console.log(await history.getMessages());/*  [    HumanMessage {      content: 'hi',      additional_kwargs: {}    },    AIMessage {      content: 'what is up?',      additional_kwargs: {}    }  ]*/

#### API Reference:

*   [HumanMessage](https://api.js.langchain.com/classes/langchain_core_messages.HumanMessage.html) from `@langchain/core/messages`
*   [AIMessage](https://api.js.langchain.com/classes/langchain_core_messages.AIMessage.html) from `@langchain/core/messages`
*   [ChatMessageHistory](https://api.js.langchain.com/classes/langchain_core_chat_history.InMemoryChatMessageHistory.html) from `langchain/stores/message/in_memory`

The added messages are saved in memory rather than saved externally as a session. For ways of persisting conversations, check out this [Integrations section](/v0.1/docs/integrations/chat_memory/).

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