Streaming large files with fetch and FormData

Hi, I'm trying to find a way to build multiplart/form-data requests in Deno that contain large files. Ideally, I'll like these requests and the underlying files to be streamed out instead of needing to read the whole file into memory and adding them as parts to the request. I can't seem to find a built-in API for acquiring a Blob-like file handle. I also tried using

npm:fetch-blob/from.js

npm:fetch-blob/from.js

but that isn't compatible with Deno. Compared to other platforms:
Node.js v20+: the

fs.openAsBlob

fs.openAsBlob

function in

node:fs

node:fs

can return a web

File

File

backed by the file system
Bun: The

Bun.file

Bun.file

function also returns a web

File

File

backed by the file system

import { fileFrom } from "npm:fetch-blob/from.js";

async function run() {
  const file = await fileFrom("./sample.txt");
  const fd = new FormData();
  fd.append("file", file);

  const res = await fetch("https://httpbin.org/anything/upload", {
    method: "POST",
    body: fd,
  });

  console.log(await res.json());
}

run();

import { fileFrom } from "npm:fetch-blob/from.js";

async function run() {
  const file = await fileFrom("./sample.txt");
  const fd = new FormData();
  fd.append("file", file);

  const res = await fetch("https://httpbin.org/anything/upload", {
    method: "POST",
    body: fd,
  });

  console.log(await res.json());
}

run();

Any suggestions on how I can make this work in Deno?

Deno•3y ago•

36 replies

disintegrator

Streaming large files with fetch and FormData

npm:fetch-blob/from.js

npm:fetch-blob/from.js

but that isn't compatible with Deno. Compared to other platforms:
Node.js v20+: the

fs.openAsBlob

fs.openAsBlob

function in

node:fs

node:fs

can return a web

File

File

backed by the file system
Bun: The

Bun.file

Bun.file

function also returns a web

File

File

backed by the file system

import { fileFrom } from "npm:fetch-blob/from.js";

async function run() {
  const file = await fileFrom("./sample.txt");
  const fd = new FormData();
  fd.append("file", file);

  const res = await fetch("https://httpbin.org/anything/upload", {
    method: "POST",
    body: fd,
  });

  console.log(await res.json());
}

run();

import { fileFrom } from "npm:fetch-blob/from.js";

async function run() {
  const file = await fileFrom("./sample.txt");
  const fd = new FormData();
  fd.append("file", file);

  const res = await fetch("https://httpbin.org/anything/upload", {
    method: "POST",
    body: fd,
  });

  console.log(await res.json());
}

run();

Any suggestions on how I can make this work in Deno?

Streaming large files with fetch and FormData

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