ChatPromptTemplate

Creates reusable prompt templates with variable interpolation. Essential for building consistent, parameterized prompts.

Syntax

langchain

ChatPromptTemplate.fromMessages([["system", "..."], ["human", "{variable}"]])

Example

langchain

import { ChatPromptTemplate } from "@langchain/core/prompts";

const prompt = ChatPromptTemplate.fromMessages([
  ["system", "You are a helpful {role}."],
  ["human", "{question}"]
]);

const chain = prompt.pipe(model);
const response = await chain.invoke({ role: "teacher", question: "What is recursion?" });