How to save a graph and load it later

[theprobugmaker]

I'm wondering, how can I save a graph in a storage and load it later? For example, imagine that I create a graph and I want to save it using some storage like PostgreSQL or something and then load it, compile, and execute. Is that possible?

Thank you.

[theprobugmaker]

I just noticed that this is a very common problem and no answer or any idea how to solve.

• Serialize the compiled graph to JSON for saving in Redis #1651
• Dynamically create graph from configs #3013

Can you give us a light 💡 please?

cc @nfcampos @vbarda @hinthornw @eyurtsev @ccurme

[theprobugmaker]

up

[nfcampos]

Hi, thanks for opening the discussion, this is something we're thinking about a bunch, we have some early things for this in this repo https://github.com/langchain-ai/langgraph-gen-py this isn't the full answer yet, but it's the direction we're thinking in. The hardest part to serialize is the custom functions that make up your nodes, what were you imagining there?

[theprobugmaker]

I think I understand where you are headed here with this. I think that the main difference is how it's handled. This one will be handled in a filesystem while in LangChain there's the dump that will work with JSON.
To make it easier to understand what I meant: It would be really similar to what Langflow does, where the user can drag and drop things up and it will be saved as JSON in the database and compiled later.

Thank you for your response.

[pedrorfig]

Hey folks, any answer on this?
I'm building a Dash application where I want to share the compiled state among callbacks through a dcc.Store which only accepts serializable object types.

[islam-nassar]

I am also keen to know if there is progress there. Saving and loading a langgraph graph is important to streamline an automatic prompt optimization framework I am building on top of langgraph.