Chatopenai
LangBot Day 1: Building a Chatbot with LangChain from Scratch
reading time: 6 minutes
Welcome to LangBot — a daily tutorial series where we build one chatbot app from scratch using LangChain . Every post adds one new concept to the same codebase, so by the end you will have a production-ready chatbot and a solid mental model of how LangChain works.
No magic. No abandoned side projects. One app, built in public, one concept at a time.
What we are building
LangBot is a conversational chatbot that runs in your terminal. Today it will be simple: you type a message, it replies. But every day this week we will add memory, prompt templates, structured output, retrieval, agents, streaming, and more — all in the same codebase.