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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 install @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: