How to Build Your First LLM Application Using LangChain and TypeScript

In this article, I will walk you through a step-by-step guide to building your first LLM-powered application using LangChain and the OpenAI model. I will be using TypeScript to build the app, and by the end you’ll have a working translator built with the OpenAI GPT-4 model and LangChain’s messaging package.

Set Up the Project

To start with, create a Node.js application and install the LangChain core library within it:

npm i langchain @langchain/core

We will be using TypeScript, so let’s configure the project to utilize it. To do that, install:

npm install -D typescript @types/node ts-node

Next, add the tsconfig.json file in the project by running this command:

npx tsc –init

Replace the tsconfig.json file with the configuration below.

Read the full article here –

https://www.telerik.com/blogs/how-build-first-llm-application-langchain-typescript

Thanks for reading.