Updating metadata file in sharepoint online via REST API - node.js

Question

I upload a file to sharepoint and trying to update its metadata, but I always get error 400 in last step.
As far as I understand, sharepoint only handles lists and items. A "folder" is a list and both metadata and files inside are items. And a "file" is a list and its metadata are items.
Documentation about updating metadata say about to make a POST request to:
https: // {site_url} / _api / web / lists / GetByTitle ('{list_title}') / items ({item_id})
Updating files must be done by PUT method (not MERGE allowed), but updating metadata must be done specifically by MERGE method. I have tried both, and both failed.
This is my current updating metadata request, but I'm continuing getting an error 400.
var data = {
"__metadata": {
"type":type
},
"Description":"lorem ipsum"
};
var headerToken = {
headers: {
'Authorization':'Bearer ' + token
, 'X-HTTP-Method':'MERGE'
, 'Accept':'application/json;odata=verbose'
, 'Content-Type':'application/json;odata=verbose'
, 'Content-Length':JSON.stringify(data).length
, 'If-Match': etag
, 'X-RequestDigest': digest
}
};
try {
var response = await axios.post(
'https://{site_url}/_api/web/lists/GetByTitle("'+MY_FOLDER+'")/items('+id+')'
, JSON.stringify(data)
, headerToken
);
return response;
}
type, etag and id are get from uploading file response and digest is get from a request to contextinfo endpoint. MY_FOLDER is a test library and at this moment is a constant.

Answer 1

You need to use single quotes in getbytitle.
"https://{site_url}/_api/web/lists/GetByTitle('"+MY_FOLDER+"')/items("+id+")"
Updated:
<script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.9.1.min.js" type="text/javascript"></script>
<script>
$(document).ready(function () {
UpdateFolder()
function UpdateFolder(){
$.ajax({
url: _spPageContextInfo.webAbsoluteUrl + "/_api/web/lists/GetByTitle('Doc')/items(30)",
type: "POST",
headers: {
"accept": "application/json;odata=verbose",
"X-RequestDigest": $("#__REQUESTDIGEST").val(),
"content-Type": "application/json;odata=verbose",
"IF-MATCH": "*",
"X-HTTP-Method": "MERGE"
},
data: "{__metadata:{'type':'SP.Data.DocItem'},test:'test'}",
/*where Title is column name and add your desired new data*/
success: function(data) {
console.log(data);
},
error: function(error) {
alert(JSON.stringify(error));
}
});
}
})
</script>