Use the get all rows Glide API. I believe it’s only available for business and enterprise. If you’re simply looking to extract the data “one and done” you could export the data from your app… settings → data → export app data
If you right click on your glide table in the data editor you will see an option that reveals all the API calls available. (Add row, set column, delete row and get all rows) API usage, other than get all rows, is available for PRO plans and higher.