| SpreadJS Documentation > API Documentation |
The following sections describe the API for SpreadJS.
| Namespace | Description |
|---|---|
| GcSpread.Sheets | Main namespace for SpreadJS. |
| GcSpread.Sheets.Calc | Namespace for the calculation utilities. |
| GcSpread.Sheets.Calc.Expressions | Namespace for calculation expressions. |
| GcSpread.Sheets.Calc.Functions | Namespace for calculation functions. |
| GcSpread.Sheets.Calc.Operators | Namespace for calculation operators. |
| GcSpread.Sheets.UndoRedo | Namespace for the undo and redo utilities. |