How to pass a File JS object to Rails controller

Question

I have a JS file object (like the one below) that I'd like to pass to my rails controller.

File {name: 'undefined', lastModified: 1652457009460, lastModifiedDate: Fri May 13 2022 10:50:09 GMT-0500 (Central Daylight Time), webkitRelativePath: '', size: 582843, …}lastModified: 1652457009460lastModifiedDate: Fri May 13 2022 10:50:09 GMT-0500 (Central Daylight Time) {}name: "undefined"size: 582843type: "image/png"webkitRelativePath: ""[[Prototype]]: FilelastModified: (...)lastModifiedDate: (...)name: (...)webkitRelativePath: (...)constructor: ƒ File()Symbol(Symbol.toStringTag): "File"size: (...)type: (...)get lastModified: ƒ lastModified()get lastModifiedDate: ƒ lastModifiedDate()get name: ƒ name()get webkitRelativePath: ƒ webkitRelativePath()[[Prototype]]: Blob I'm trying to pass it inside a data object like this:

data: { someData: '', myFile: JSON.stringify(myFile)}

Unfortunately that results in passing an empty object like below:

data: { someData: '', myFile: {}}

If I try to pass it without stringifying it I get:

serialize.js:66 Uncaught TypeError: Illegal invocation

The only way I've been able to do it is via FormData() like:

const formData = new FormData(); formData.append("file", myFile); However, I cannot use formData in this occasion for other reasons.

Can you provide some guidance on what other ways are there to pass this data?