Prompt Templates

This example walks through how to use PromptTemplates. At their core, prompt templates are objects that are made up of a template with certain input variables. This object can then be called with .format(...) to format the input variables accordingly.

import { PromptTemplate } from "langchain/prompts";
const template = "What is a good name for a company that makes {product}?";
const prompt = new PromptTemplate({
  template: template,
  inputVariables: ["product"],
});

Let's now see how this works! We can call the .format method to format it.

const res = await prompt.format({ product: "colorful socks" });
console.log({ res });

{ res: 'What is a good name for a company that makes colorful socks?' }