How to fix Error with the Azure Javascript SDK for Ai Search: unexpected 'StartObject' node was found for property named 'metadata' when reading from the JSON reader

Question

I'm trying to make calls to a Azure Ai Search index I have already set up. Specifically I'm trying to add documents via the AzureAISearchVectorStore.addDocuments from the "@langchain/community/vectorstores/azure_aisearch" package.

No matter what I've tried I get the error:

Azure AI Search uploadDocuments batch failed: RestError: The request is invalid. Details: An unexpected 'StartObject' node was found for property named 'metadata' when reading from the JSON reader. A 'PrimitiveValue' node was expected

Even if I omit metadata entirely.

My code looks something like this:

const embeddings = new AzureOpenAIEmbeddings({
  maxRetries: 1,
  // azureOpenAIApiKey etc in env
});

const searchClient = new SearchClient

Answer 1

Hmmm, it looks like the python langchain_core.documents Documents class was casting metadata to a stringified object. That may be my issue.

Looks like there's no way to do the same in the JS version