outlook-grap-api-get-all-folders-and-ids.js

outlook-grap-api-get-all-folders-and-ids.js

// Retrieve the token from the browser via https://developer.microsoft.com/en-us/graph/graph-explorer
// 1. Click "Sign in with Microsoft" and sign in with your account
// 2. Select a Outlook mailbox request, e.g. "GET /me/mailFolders"
// 3. Click Tab "Modify permissions", select "Mail.Read" and click "Modify permissions"
// 4. Click Tab "Access token" and copy the token
// 5. Paste the token into the const TOKEN below
const TOKEN = ""


// cleanup the graph response for /mailFolders request to only include the id, displayName and childFolderCount
function cleanupFoldersResponse(data) {
  return data.value.map(({ id, displayName, childFolderCount }) => { return { id, displayName, childFolderCount } })
}


// fetch all root folders from the mailbox via the Graph API (https://graph.microsoft.com/v1.0/me/mailFolders)
async function fetchRootFolders() {
  const response = await fetch('https://graph.microsoft.com/v1.0/me/mailFolders', {
    method: 'GET',
    headers: {
      'Authorization': `Bearer ${TOKEN}`
    }
  })
  const data = await response.json()
  return data
}


// fetch all folders in a specific folder via the Graph API (https://graph.microsoft.com/v1.0/me/mailFolders/{folderId}/childFolders)
async function fetchFolders(folderId) {
  const response = await fetch(`https://graph.microsoft.com/v1.0/me/mailFolders/${folderId}/childFolders`, {
    method: 'GET',
    headers: {
      'Authorization': `Bearer ${TOKEN}`
    }
  })
  const data = await response.json()
  return data
}

// ##### MAIN #####

// check if the ROOT_FOLDER_NAME exists and get its id
const root_folders_list = cleanupFoldersResponse(await fetchRootFolders())
//console.log(root_folders_list);

// fetch folders for each root folder
const root_with_sub_folders_list = await Promise.all(root_folders_list.map(async (folder) => {
  if (folder.childFolderCount === 0) return { ...folder, childFolders: [] }

  const childFolders = await fetchFolders(folder.id)
  return {
    ...folder,
    childFolders: cleanupFoldersResponse(childFolders)
  }
}))

// log as tree
root_with_sub_folders_list.forEach((root) => {
  console.log(`<${root.displayName}> (${root.id})`)
  root.childFolders.forEach((sub) => {
    console.log(`  <${sub.displayName}> (${sub.id})`)
  })
})