How can I update datasetItems via the API? (using typescript SDK)

[levyshachar2LR]

Describe your question

Hello all!
we are working on doing benchmarks and having tests using langfuse datasets and items.
we have a process at the moment, where we define the test case locally using YAML and we sync it to langfuse dataset where each dataset item is a testcase (a yaml file).

now, there can be a case where the local yaml file needs to change, for example when we add a new scorer / change the input text from the user etc...

I couldn't find a way to update the datasetItems from the SDK.
we only have the following:
Create / Get / Delete / List.

I did see however, that in the UI there is an option to update an it triggers the following API
POST https://langfuse.internal.ai.lightrun.com/api/trpc/datasets.updateDatasetItem

is there a way we can invoke this API from the SDK?

thanks for the help

Langfuse Cloud or Self-Hosted?

Self-Hosted

If Self-Hosted

v3.111.0 OSS

If Langfuse Cloud

No response

SDK and integration versions

"@langfuse/otel": "^4.5.1",
"@langfuse/client": "^4.5.1",

Pre-Submission Checklist

• I have checked for existing issues/discussions and consulted Langfuse AI.

[inkeep-ai-assistant[bot]]

Based on the available sources, I don't have information about updating dataset items via the TypeScript SDK. The sources only document CreateDatasetRunItemRequest for creating dataset run items(1), and PaginatedDatasetRunItems for retrieving them(2).

The internal tRPC API endpoint you mentioned (datasets.updateDatasetItem) is not documented in the public API reference materials available.

For your use case of syncing YAML test cases to Langfuse datasets, you might need to implement a delete-and-recreate workflow using the existing SDK methods (delete the old item, create a new one with updated content) until an update method becomes available in the SDK.

Check out these potentially useful sources:

• CreateDatasetRunItemRequest
• Troubleshooting and FAQ

Would you like a general answer based on my knowledge instead?

📚 Sources:

1. CreateDatasetRunItemRequest
2. PaginatedDatasetRunItems

---

Have another question? Just tag @inkeep.

[jannikmaierhoefer]

Hi @levyshachar2LR, yes, you can update a Dataset Item by using the API to post a dataset item with the same id but different content. You can use the POST /api/public/dataset-items endpoint - it will create a new item if the id doesn't exist, or update the existing item if it does.

# Create a dataset item
curl -X POST "https://your-langfuse-instance/api/public/dataset-items" \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "datasetName": "my-dataset",
    "id": "my-custom-id",
    "input": {"original": "data"},
    "expectedOutput": {"result": "A"}
  }'
 
# Update the same item by posting with the same id
curl -X POST "https://your-langfuse-instance/api/public/dataset-items" \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "datasetName": "my-dataset",
    "id": "my-custom-id",
    "input": {"updated": "data"}
  }'
# Result: input is updated, expectedOutput remains {"result": "A"}
´´´

[levyshachar2LR]

Thank you, it works!