String output parser

The StringOutputParser takes language model output (either an entire response or as a stream) and converts it into a string. This is useful for standardizing chat model and LLM output.

This output parser can act as a transform stream and work with streamed response chunks from a model.

Usage

tip

See this section for general instructions on installing integration packages.

npm

npm install @langchain/openai

Yarn

yarn add @langchain/openai

pnpm

pnpm add @langchain/openai

import { ChatOpenAI } from "@langchain/openai";
import { StringOutputParser } from "@langchain/core/output_parsers";

const parser = new StringOutputParser();

const model = new ChatOpenAI({ temperature: 0 });

const stream = await model.pipe(parser).stream("Hello there!");

for await (const chunk of stream) {
  console.log(chunk);
}

/*
  Hello
  !
  How
  can
  I
  assist
  you
  today
  ?
*/

API Reference:

• ChatOpenAI from @langchain/openai
• StringOutputParser from @langchain/core/output_parsers