Upload a blob file created using javascript to a php server


let myFile = new Blob(["A file"], { type: "text/plain"});
fetch("server_location.php", {
  method: "POST",
  body: myFile,
  headers: {
    "Content-Type": "text/plain"
  }).then((res) => { return res.text(); }.then((text) => { console.log(text) };



Should show the file in the file array
array (0)

Please give me a solution so that I can upload custom text blob file created in javascript to my php server.

>Solution :

$_FILES is populated when you upload a request formatted as Multipart Form Data and labeled with the current content-type.

You are uploading a blob labelled as plain text, and stringifed (probably to [object Object]).

To send a multipart request, use a FormData object.

const myFile = new Blob(["A file"], { type: "text/plain"});
const data = new FormData();
data.append("myFile", myFile, "filename.txt");
fetch("server_location.php", {
    method: "POST",
    body: data,

To send plain text and read it:

  • Don’t use a blob
  • Do read from STDIN
fetch("server_location.php", {
    method: "POST",
    body: "a plain text string",
    headers: { "Content-Type": "text/plain" }


$data = file_get_contents("php://input");

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