> ## Documentation Index
> Fetch the complete documentation index at: https://docs.langchain.com/llms.txt
> Use this file to discover all available pages before exploring further.

# MISSING_CHECKPOINTER

You are attempting to use built-in LangGraph persistence without providing a checkpointer.

This happens when a `checkpointer` is missing in the `compile()` method of [`StateGraph`](https://reference.langchain.com/javascript/langchain-langgraph/index/StateGraph) or [`entrypoint`](https://reference.langchain.com/javascript/langchain-langgraph/index/entrypoint).

## Troubleshooting

The following may help resolve this error:

* Initialize and pass a checkpointer to the `compile()` method of [`StateGraph`](https://reference.langchain.com/javascript/langchain-langgraph/index/StateGraph) or [`entrypoint`](https://reference.langchain.com/javascript/langchain-langgraph/index/entrypoint).

```typescript theme={"theme":{"light":"catppuccin-latte","dark":"catppuccin-mocha"}}
import { InMemorySaver, StateGraph } from "@langchain/langgraph";
const checkpointer = new InMemorySaver();

// Graph API
import { StateGraph } from "@langchain/langgraph";
const graph = new StateGraph(...).compile({ checkpointer });

// Functional API
import { entrypoint } from "@langchain/langgraph";
const workflow = entrypoint(
    { checkpointer, name: "workflow" },
    async (messages: string[]) => {
        // ...
    }
);
```

* Use the LangGraph API so you don't need to implement or configure checkpointers manually. The API handles all persistence infrastructure for you.

## Related

* Read more about [persistence](/oss/javascript/langgraph/persistence).

***

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