import { ConcatenatedJsonParseStream } from "https://deno.land/std@0.189.0/json/concatenated_json_parse_stream.ts";

const url = "https://deno.land/std@0.189.0/json/testdata/test.concatenated-json";
const { body } = await fetch(url);

const readable = body!
  .pipeThrough(new TextDecoderStream()) // convert Uint8Array to string
  .pipeThrough(new ConcatenatedJsonParseStream()); // parse Concatenated JSON

for await (const data of readable) {
  console.log(data);
}