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@langchain/core

Core LangChain.js abstractions and schemas

v1.2.12, 20 Sept 2026MITESM + CommonJSTypes: Bundled
$ npm install @langchain/core
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Key numbers

As of 25 Sept 2026
Weekly downloads
3.9m
+178% over 12 months
Gzip bundle size
-
No Bundlephobia data
Dependencies
7
Direct, from package.json
Last release
5 days ago
v1.2.12
GitHub stars
18.2k
3.4k forks
Open issues / PRs
231 / 352
Contributors
-
Commits, last 52 weeks
1,288

Downloads

Last week 2026-09-15 to 2026-09-21
02m4m6mSept 2025Mar 2026Sept 2026High 5.7m (25 Aug 2026)Low 1.3m (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.

3,889,523 downloads last week, 20,162,306 in the last month. The 12-month change of +178% compares the average of the last 4 weeks with the first 4 weeks of the series.

Maintenance

Releases, last 12 months
73264 in total
Latest version
1.2.12, 20 Sept 20265 days ago
First published
22 Nov 2023
Last push to GitHub
25 Sept 2026same day as the snapshot
Repository archived
No
Open issues
231
Open pull requests
352
Commits, last 52 weeks
1,288
Dependents on npm
2,175

Major versions

  1. v1 first release 1.0.0, 17 Oct 2025
  2. v0 first release 0.0.0, 22 Nov 2023

Recent releases

VersionPublished
1.2.1220 Sept 2026
1.2.1112 Sept 2026
1.2.109 Sept 2026
1.2.920 Aug 2026
1.2.814 Aug 2026
1.2.713 Aug 2026
1.2.612 Aug 2026
1.2.55 Aug 2026
1.2.430 Jul 2026
1.2.314 Jul 2026
1.2.29 Jul 2026
1.2.122 Jun 2026
1.2.017 Jun 2026
1.1.4912 Jun 2026

Compatibility

Module format
ESM + CommonJSFrom package.json type, main and exports fields
TypeScript types
Bundled
Node.js engine range
>=20
Runtimes
-
Unpacked size (npm)
7.3 MB
Dependencies (7)
zodp-queuemustachelangsmithjs-tiktoken@cfworker/json-schema@standard-schema/spec

Install

npm install @langchain/core

CDN

jsDelivr: 785.7k requests in 30 days
  • jsDelivrhttps://cdn.jsdelivr.net/npm/@langchain/core@1.2.12/
  • unpkghttps://unpkg.com/@langchain/core@1.2.12/
  • esm.shhttps://esm.sh/@langchain/core@1.2.12
Sources: npm registry, npm downloads API, GitHub API, jsDelivr. Data fetched 25 Sept 2026.

Indexability: Not indexed (discovery only): no category.