@langchain/langgraph-checkpoint-mongodb

Implementation of a LangGraph.js CheckpointSaver that uses a MongoDB instance.

Usage

``ts
import { MongoClient } from "mongodb";
import { MongoDBSaver } from "@langchain/langgraph-checkpoint-mongodb";

const writeConfig = {
configurable: {
thread_id: "1",
checkpoint_ns: ""
}
};
const readConfig = {
configurable: {
thread_id: "1"
}
};


const client = new MongoClient(process.env.MONGODB_URL);

const checkpointer = new MongoDBSaver({ client });
const checkpoint = {
v: 1,
ts: "2024-07-31T20:14:19.804150+00:00",
id: "1ef4f797-8335-6428-8001-8a1503f9b875",
channel_values: {
my_key: "meow",
node: "node"
},
channel_versions: {
__start__: 2,
my_key: 3,
"start:node": 3,
node: 3
},
versions_seen: {
__input__: {},
__start__: {
__start__: 1
},
node: {
"start:node": 2
}
},
pending_sends: [],
}

// store checkpoint
await checkpointer.put(writeConfig, checkpoint, {}, {});

// load checkpoint
await checkpointer.get(readConfig);

// list checkpoints
for await (const checkpoint of checkpointer.list(readConfig)) {
console.log(checkpoint);
}

await client.close();
``