node.js – How do I send big files in nodejs from the client to the server without an “Uncaught out of memory” error?

When sending a big file, such as one over twenty megabytes from the client to the server using a fetch request, the HTML page with the file input freezes for about 10 seconds and gives the error in the console:

“Uncaught out of memory”

This is my JavaScript code that I think is part of the issue:

for (let i = 0; i < files.length; i++) {
const file = files[i];
const reader = new FileReader();

reader.onload = function(event) {
const fileData = new Uint8Array(event.target.result);

const postFileData = {
    file: {
        name: file.name,
        type: file.type,
        data: Array.from(fileData)
    }
}

fetch("/file", {
    method: "POST",
    headers: {
        "Content-Type": "application/json"
    },
    body: JSON.stringify(postFileData)
});
};

I tried making the code split the file’s post data and send it one by one, however I am not sure how to properly do it.