For SPO, we can add AddSubFolderUsingPath method:

[yogendermanral]

For SPO, we can add AddSubFolderUsingPath method:

/_api/web/GetFolderByServerRelativePath(DecodedUrl=@a1)/AddSubFolderUsingPath(DecodedUrl=@a2)?@a1=...&@a2=...

It can create a folder item in one call in a subfolder. Even now this endpoint can be used with the help of SPHttpClient. The method is rather simple, it's a POST with 2 params: the first one stands for folder relative url, where to create, the second one is FileLeafRef/Title of a folder to create.

For non-modern API this can be used:

const list = sp.web.lists.getByTitle('ListA');
const folderName = 'My subfolder';
const rootFolder = 'Folder 1/Folder 2';
list.items.add({
  Title: Util.getGUID(),
  // The folder is created in a root, so create it first with a temp unique name
  FileSystemObjectType: 1,
  ContentTypeId: '0x0120'
  // FileLeafRef unfortunately is ignored while creation
}).then(({ item }) => {
  return item.update({
    Title: folderName, // Rename the folder name
    FileLeafRef: `${rootFolder}/${folderName}` // Move to a subfolder
  });
}).then(console.log);

Originally posted by @koltyakov in #100 (comment)

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