Note: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.

formatNumber()

1var num = 10000;
2// Returns 10,000
3var formatted = $A.localizationService.formatNumber(num);