Type of object received during file upload using @UploadFile

You can import the type from the package. '@types/multer' and then qualify the file as:

        @UploadedFile() file: Express.Multer.File,

https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/multer/index.d.ts#L103

You can save the file by specifying a destination path in the MulterOptions:

// files will be saved in the /uploads folder
@UseInterceptors(FileInterceptor('file', {dest: 'uploads'}))

---

If you want more control over how your file is saved, you can create a multer diskStorage configuration object instead:

import { diskStorage } from 'multer';

export const myStorage = diskStorage({
  // Specify where to save the file
  destination: (req, file, cb) => {
    cb(null, 'uploads');
  },
  // Specify the file name
  filename: (req, file, cb) => {
    cb(null, Date.now() + '-' + file.originalname);
  },
});

And then pass it to the storage property in your controller.

@UseInterceptors(FileInterceptor('file', {storage: myStorage}))

For more configuration options, see the multer docs.