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Building with LangChain JS and TypeScript v1.0.0

Use this resource to build an LLM application with LangChain in JavaScript or TypeScript

New

  • 475 downloads
  • 157 likes
  • 117 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install langchain-js-llm-app-development

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

The agent installs the LangChain packages you need, writes LCEL chains that combine prompt, model and parser, binds tools to models and sets up a RAG pipeline. You get a working code base for an LLM application.

Mostly picked by

Updated November 2, 2026

Card for the “Building with LangChain JS and TypeScript” skill

Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

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What you get

  • SKILL.md: installation, chat models and basic usage
  • REFERENCE.md: supplementary reference for chains, tools and integrations

Good fit for

  • You add a language model to a TypeScript application
  • You build retrieval-augmented generation (RAG)

Not for

    Tags

    • langchain
    • llm
    • typescript
    • rag
    • chain

    About

    You say

    “Build an LCEL chain that summarizes a document, then pipes it into a chat model.”

    Card for the “Building with LangChain JS and TypeScript” skill

    Skill published by laurigates under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to build an LLM application with LangChain in JavaScript or TypeScript
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • REFERENCE.md3.1 KB
    • SKILL.md6.7 KB

    Origin and licence

    Listed unmodified

    Author
    laurigates
    Source
    github.com/laurigates/claude-plugins/tree/3cbda15de062aa6d3302afd330afb0ff1c8979df/langchain-plugin/skills/langchain-development
    Licence
    MIT

    Notice

    « langchain-development » (laurigates, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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