# Cannot rewrite cURL to JavaScript

**URL:** <https://forums.rocket.chat/t/cannot-rewrite-curl-to-javascript/8220>\
**Category:** Community Support\
**Created:** [August 20, 2020, 4:59pm UTC](https://forums.rocket.chat/t/cannot-rewrite-curl-to-javascript/8220 "2020-08-20T16:59:27Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Alex1992](https://avatars.discourse-cdn.com/v4/letter/a/94ad74/32.png) [@Alex1992](https://forums.rocket.chat/u/Alex1992)\
**Post date:** [August 20, 2020, 4:59pm UTC](https://forums.rocket.chat/t/cannot-rewrite-curl-to-javascript/8220/1 "2020-08-20T16:59:28Z")

</div>

### Description

I’m trying to rewrite this here [https://docs.rocket.chat/api/rest-api/methods/rooms/upload](https://docs.rocket.chat/api/rest-api/methods/rooms/upload) in pure JavaScript

```bash
curl "http://localhost:3000/api/v1/rooms.upload/GENERAL" \
    -F file=@$HOME/example.txt \
    -H "X-Auth-Token: ijFlJ1yfidXhwEYY284Anoq_iEsOeMMVCupzNhX22tB" \
    -H "X-User-Id: hw5DThnhQmxDWnavu"

```

but I get a bad-request error 400 with the JavaScript equivalent whereas the cURL command works.

That is my JavaScript equivalent:

```javascript
var xhr = new XMLHttpRequest();
xhr.open("POST", 'http://localhost:3000/api/v1/rooms.upload/GENERAL', true);

const formData = new FormData();
formData.append("upload", file); // file has type File https://www.javascripture.com/File

xhr.setRequestHeader("Content-Type", "multipart/form-data");
xhr.setRequestHeader("X-Auth-Token", "ijFlJ1yfidXhwEYY284Anoq_iEsOeMMVCupzNhX22tB");
xhr.setRequestHeader("X-User-Id", "hw5DThnhQmxDWnavu");
xhr.send(formData);

```

See here for cURL documentation of the parameter F [https://curl.haxx.se/docs/manpage.html#-F](https://curl.haxx.se/docs/manpage.html#-F)  
Have somebody an idea why it does not work?