Skip to content
JS
Package

langfuse-langchain

LEGACY Langfuse v3 integration for LangChain (maintenance mode). For new projects use the current CallbackHandler from @langfuse/langchain: npm install @langfuse/langchain @langfuse/otel

v3.39.2, 15 Sept 2026MITESM + CommonJSTypes: BundledMonitoring and error trackingTypeScript tooling
$ npm install langfuse-langchain

Key numbers

As of 25 Sept 2026
Weekly downloads
96.3k
+182% over 12 months
Gzip bundle size
-
No Bundlephobia data
Dependencies
2
Direct, from package.json
Last release
9 days ago
v3.39.2
GitHub stars
169
108 forks
Open issues / PRs
11 / 39
Contributors
-
Commits, last 52 weeks
245

Downloads

Last week 2026-09-15 to 2026-09-21
0100k200k300kSept 2025Mar 2026Sept 2026High 241.6k (14 Jul 2026)Low 38.4k (23 Dec 2025)
Weekly npm downloads, one point per week, weeks starting 23 Sept 2025 to 15 Sept 2026. The y axis starts at zero.

96,310 downloads last week, 737,944 in the last month. The 12-month change of +182% compares the average of the last 4 weeks with the first 4 weeks of the series.

Releases, last 12 months
-
Latest version
3.39.2, 15 Sept 20269 days ago
First published
-
Last push to GitHub
24 Sept 2026same day as the snapshot
Repository archived
No
Open issues
11
Open pull requests
39
Commits, last 52 weeks
245
Dependents on npm
35

Major versions

-

Recent releases

-

Module format
ESM + CommonJSFrom package.json type, main and exports fields
TypeScript types
Bundled
Node.js engine range
>=18
Runtimes
-
Unpacked size (npm)
169 kB
Dependencies (2)
langfuselangfuse-core
Peer dependencies (1)
langchain
npm install langfuse-langchain
  • jsDelivrhttps://cdn.jsdelivr.net/npm/langfuse-langchain@3.39.2/
  • unpkghttps://unpkg.com/langfuse-langchain@3.39.2/
  • esm.shhttps://esm.sh/langfuse-langchain@3.39.2
PackageWeekly downloadsGzipLast releaseModuleComparison
@posthog/ai507.7k-todayESM + CommonJS-
@posthog/mcp156.9k-1 day agoESM + CommonJS-
posthog-js10m-todayESM + CommonJS-
posthog-node8m-1 day agoESM + CommonJS-
@posthog/next49.9k-23 days agoESM only-
@posthog/convex27.4k-3 days agoESM + CommonJS-
@pothos/plugin-tracing29k-11 days agoESM + CommonJS-
@segment/analytics-consent-wrapper-onetrust16.8k-11 months agoESM + CommonJS-
Sources: npm registry, npm downloads API, GitHub API. Data fetched 25 Sept 2026.

Indexability: Indexed.