SharePoint Online: Delete All List Items using PowerShell

Requirement: Delete All Items from SharePoint Online List using PowerShell

We have a list in SharePoint Online - Office 365 site with a bunch of items. Need them to be deleted in bulk rather deleting one by one from SharePoint web UI. So, let us use SharePoint Online PowerShell to delete all list items.

SharePoint Online: How to Delete All Items in a List?
To delete all items from a SharePoint Online list, do the following:

• Browse to your list, select all items in the list by ticking the checkbox besides the first column on the list. This should highlight all items in the list view. 
• Click the "Delete" button in the list's menu bar.
  
• Confirm the prompt. The selected item will be sent to the recycle bin.

SharePoint allows you to select 100 items at once! However, in modern lists, you can select all items by scrolling to the bottom of the page - so that SharePoint loads and selects the remaining items. What if you have a very larger list? Well, PowerShell is the time-saver here!

Delete All List Items in Bulk in SharePoint Online using PowerShell:
Here is the script to delete all list items in SharePoint online Office 365 using the client-side object model (CSOM) with PowerShell.

#Load SharePoint CSOM Assemblies
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"
  
#Parameters
$SiteURL="https://crescent.sharepoint.com"
$ListName="Projects"

#Get Credentials to connect 
$Cred = Get-Credential

#Setup the context
$Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
$Ctx.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.Username, $Cred.Password)

#Get the List items to delete
$List = $Ctx.web.Lists.GetByTitle($ListName)
$ListItems = $List.GetItems([Microsoft.SharePoint.Client.CamlQuery]::CreateAllItemsQuery()) 
$Ctx.Load($ListItems)
$Ctx.ExecuteQuery()       
 
write-host "Total Number of List Items found:"$ListItems.Count
 
#SharePoint Online PowerShell to delete all list items
If($ListItems.Count -gt 0)
{
    #Loop through each item and delete
    For($i = $ListItems.Count-1; $i -ge 0; $i--)
    {
        $ListItems[$i].DeleteObject()
    } 
    $Ctx.ExecuteQuery()
         
    Write-Host "All List Items deleted Successfully!"
}
 

This PowerShell script deletes all items from the SharePoint Online list. Please note, these items are not moved to the Recycle Bin but deleted permanently! This PowerShell script could be quite helpful when dealing with deleting bulk items from a huge list.

PowerShell to Delete All Items from Large Lists in SharePoint Online
When you have a SharePoint Online list or library with a larger number of items (>5000), You may face "The attempted operation is prohibited because it exceeds the list view threshold enforced by the administrator." error. So, to mitigate this issue let us delete list items in the batch. Here is my PowerShell script to delete list items in the batch.

Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"
    
#Config Parameters
$SiteURL="https://crescent.sharepoint.com"
$ListName="Projects"
$BatchSize = 500
  
#Setup Credentials to connect
$Cred = Get-Credential
  
Try {
    #Setup the context
    $Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
    $Ctx.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.UserName,$Cred.Password)
  
    #Get the web and List
    $Web = $Ctx.Web
    $List=$web.Lists.GetByTitle($ListName)
    $Ctx.Load($List)
    $Ctx.ExecuteQuery()
    Write-host "Total Number of Items Found in the List:"$List.ItemCount
 
    #Define CAML Query to get list items in batches
    $Query = New-Object Microsoft.SharePoint.Client.CamlQuery
    $Query.ViewXml = "<View Scope='RecursiveAll'><RowLimit Paged='TRUE'>$BatchSize</RowLimit></View>"
 
    Do {  
        #Get items from the list in batches
        $ListItems = $List.GetItems($Query)
        $Ctx.Load($ListItems)
        $Ctx.ExecuteQuery()
         
        #Exit from Loop if No items found
        If($ListItems.count -eq 0) { Break; }
 
        Write-host Deleting $($ListItems.count) Items from the List...
 
        #Loop through each item and delete
        ForEach($Item in $ListItems)
        {
            $List.GetItemById($Item.Id).DeleteObject()
        } 
        $Ctx.ExecuteQuery()
 
    } While ($True)
 
    Write-host -f Green "All Items Deleted!"
}
Catch {
    write-host -f Red "Error Deleting List Items!" $_.Exception.Message
}

This script deletes all list items in SharePoint Online using PowerShell.

SharePoint Online PnP PowerShell to Delete All List Items
Here is the PnP PowerShell to empty list in SharePoint Online

#Config Variables
$SiteURL = "https://crescenttech.sharepoint.com/sites/marketing"
$ListName ="Records"

#Get Credentials to connect
$Cred = Get-Credential

Try {
    #Connect to PNP Online
    Connect-PnPOnline -Url $SiteURL -Credentials $Cred
    
    #Get All List Items in Batch
    $ListItems = Get-PnPListItem -List $ListName -PageSize 1000 | Sort-Object ID -Descending

    #sharepoint online powershell delete all items in a list
    ForEach ($Item in $ListItems)
    {
        Remove-PnPListItem -List $ListName -Identity $Item.Id -Force
    }
}
catch {
    write-host "Error: $($_.Exception.Message)" -foregroundcolor Red
}

Use -Recycle parameter to send the items to the recycle bin instead of permanently deleting it! To delete all files from a SharePoint Online document library, use: SharePoint Online: Delete All Files in a Document Library using PowerShell