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Zep Memory

Zep is a memory server that stores, summarizes, embeds, indexes, and enriches conversational AI chat histories, autonomous agent histories, document Q&A histories and exposes them via simple, low-latency APIs.

Key Features:

  • Long-term memory persistence, with access to historical messages irrespective of your summarization strategy.
  • Auto-summarization of memory messages based on a configurable message window. A series of summaries are stored, providing flexibility for future summarization strategies.
  • Vector search over memories, with messages automatically embedded on creation.
  • Auto-token counting of memories and summaries, allowing finer-grained control over prompt assembly.
  • Python and JavaScript SDKs.


See the instructions from Zep for running the server locally or through an automated hosting provider.

npm install @langchain/openai @langchain/community


import { ChatOpenAI } from "@langchain/openai";
import { ConversationChain } from "langchain/chains";
import { ZepMemory } from "@langchain/community/memory/zep";
import { randomUUID } from "crypto";

const sessionId = randomUUID(); // This should be unique for each user or each user's session.
const zepURL = "http://localhost:8000";

const memory = new ZepMemory({
baseURL: zepURL,
// This is optional. If you've enabled JWT authentication on your Zep server, you can
// pass it in here. See
apiKey: "change_this_key",

const model = new ChatOpenAI({
model: "gpt-3.5-turbo",
temperature: 0,

const chain = new ConversationChain({ llm: model, memory });
console.log("Memory Keys:", memory.memoryKeys);

const res1 = await{ 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{ input: "What did I just say my name was?" });
console.log({ res2 });

res1: {
text: "You said your name was Jim."
console.log("Session ID: ", sessionId);
console.log("Memory: ", await memory.loadMemoryVariables({}));

API Reference:

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