textlinestream

TextLineStream - Split WHATWG streams into lines

Transform a stream into a stream where each chunk is divided by a newline, be it \n or \r\n. \r can be enabled via the allowCR option.

Returning empty lines can be enabled using the returnEmptyLines option.

This is a slightly extended version of Deno's TextLineStream.

import { TextLineStream } from "textlinestream";
const res = await fetch("https://example.com");
const lines = res.body
  .pipeThrough(new TextDecoderStream())
  .pipeThrough(new TextLineStream());

Installation

npm i textlinestream

NDJSON - Newline Delimited JSON

Each line may be transformed by specifying a mapper function (mapperFun) in the options argument.

import { TextLineStream } from "textlinestream";
const res = await fetch("https://example.com");
const lines = res.body
  .pipeThrough(new TextDecoderStream())
  .pipeThrough(new TextLineStream({
    mapperFun: JSON.parse
  }));

for await (const obj of lines) {
  // where obj is a js object
} 

License

MIT