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langfuse-node

v3.39.2

Published

LEGACY Langfuse v3 SDK for Node.js < 18 (maintenance mode). For new projects use the current Langfuse JS/TS SDK: npm install @langfuse/tracing @langfuse/otel @langfuse/client

Vulnerabilities

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Links

Git

Maintainers

bezbacbezbacmdeichmannmdeichmannmarliessophiemarliessophiehassiebhassiebmarcklingenmarcklingenwochingewochinge

Keywords

langfuselegacydeprecatedllmobservabilitytracing

Readme

GitHub Banner

langfuse-node

MIT License npm package GitHub Repo stars Discord YC W23

[!IMPORTANT] This package is not the latest Langfuse JS/TS SDK. langfuse-node is part of the deprecated v3 client. Do not use it for new instrumentation.

Latest JS/TS SDK (OpenTelemetry, Node.js 20+): npm install @langfuse/tracing @langfuse/otel @opentelemetry/sdk-node. Use @langfuse/tracing + LangfuseSpanProcessor from @langfuse/otel. Prompts/datasets/scores: @langfuse/client. Docs: https://langfuse.com/docs/observability/sdk/overview — Upgrade: v3 → v4, v4 → v5.

Query traces with Observations API v2 (GET /api/public/v2/observations, API reference), not GET /api/public/traces / api.traceList.

Data freshness: the only real-time path is OpenTelemetry ingestion (@langfuse/otel, or any OTel exporter sending x-langfuse-ingestion-version: 4) combined with the Observations API v2 and Metrics API v2. All other GET APIs from all SDK packages can be up to 10 minutes behind.

This is the legacy Node.js client for Langfuse v3.

Do not install langfuse or langfuse-node for new work — use @langfuse/tracing + @langfuse/otel instead.

Documentation

  • Docs: https://langfuse.com/docs/sdk/typescript
  • Reference: https://js.reference.langfuse.com/modules/langfuse_node.html

Installation

npm i langfuse-node
# or
yarn add langfuse-node
# or
pnpm i langfuse-node