The search results code for accessing the internal id and name of the sub folders inside a folder in file cabinet
the sub folders is obtained using the internal id of its parent folder, here internal id of parent folder is 386206
filters = [
new nlobjSearchFilter('parent', null, 'is', 386206),
];
columns = [
new nlobjSearchColumn('internalid'), new nlobjSearchColumn('name')
];
searchResults = nlapiSearchRecord('folder', null, filters, columns);
console.log("search result for folders", searchResults);

The search result for accessing the files inside a folder using the internal id of the folder, which include the internal id, name, URL and file type
filters = [
new nlobjSearchFilter('internalid', null, 'is', 386313),
];
columns = [
new nlobjSearchColumn('internalid'),
new nlobjSearchColumn('name', 'file'),
new nlobjSearchColumn('url', 'file'),
new nlobjSearchColumn('filetype', 'file')
];
searchResults = nlapiSearchRecord('folder', null, filters, columns);
console.log("searchresult", searchResults);
