Blob

const obj = { hello: "world" };
const blob = new Blob([JSON.stringify(obj, null, 2)], {
  type: "application/json",
});

<p>
  This example creates a typed array containing the ASCII codes for the space
  character through the letter Z, then converts it to an object URL. A link to
  open that object URL is created. Click the link to see the decoded object URL.
</p>

function showViewLiveResultButton() {
  if (window.self !== window.top) {
    // Ensure that if our document is in a frame, we get the user
    // to first open it in its own tab or window. Otherwise, this
    // example won't work.
    const p = document.querySelector("p");
    p.textContent = "";
    const button = document.createElement("button");
    button.textContent = "View live result of the example code above";
    p.append(button);
    button.addEventListener("click", () => window.open(location.href));
    return true;
  }
  return false;
}

if (!showViewLiveResultButton()) {
  function typedArrayToURL(typedArray, mimeType) {
    return URL.createObjectURL(
      new Blob([typedArray.buffer], { type: mimeType }),
    );
  }
  const bytes = new Uint8Array(59);

  for (let i = 0; i < 59; i++) {
    bytes[i] = 32 + i;
  }

  const url = typedArrayToURL(bytes, "text/plain");
  const link = document.createElement("a");

  link.href = url;
  link.innerText = "Open the array URL";
  document.body.appendChild(link);
}

const reader = new FileReader();
reader.addEventListener("loadend", () => {
  // reader.result contains the contents of blob as a typed array
});
reader.readAsArrayBuffer(blob);

const text = await new Response(blob).text();

const text = await blob.text();