How to delete a thread with MemorySaver?

Question

I'm using langgraph.js to create a simple chatbot.

When the session has ended I'd like to be able to delete the thread but I haven't been able to find any way to do this in the docs.

     this.graph = new StateGraph(AssistantState)
            .addNode('route_node', this.routeNode.bind(this))
            .addNode('init_node', this.initNode.bind(this))
            .addNode('agent', this.agentNode.bind(this))

            .addEdge(START, 'route_node')
            .addConditionalEdges('route_node', async (state) => state.route)

            .addEdge('init_node', END)
            .addEdge('agent', END)

            .compile({ checkpointer: new MemorySaver() })

Any ideas how this is done? Thanks!

imv · Accepted Answer · 2025-07-09 07:58:29Z

0

as far as I've investigated there is no built in way to delete a thread, which doesn't make sense in my opinion if that's the case. Anyways here is a workaround:


function createEmptyCheckpoint() {
    return {
        v: 1,
        ts: new Date().toISOString(),
        id: crypto.randomUUID(),
        channel_values: {},
        channel_versions: {
            __start__: 1,
        },
        versions_seen: {
            __input__: {},
            __start__: {}
        },
        pending_sends: [],
    };
}

async function clearThread(checkpointer: any, threadId: string) {
    const config = {
        configurable: {
            thread_id: threadId,
            checkpoint_ns: ""
        }
    };

    const emptyCheckpoint = createEmptyCheckpoint();

    await checkpointer.put(config, emptyCheckpoint, {}, {});
}

https://github.com/langchain-ai/langchain/discussions/19744

edited Jul 9 at 7:58

answered Jul 2 at 22:08

imv

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