Join MDN and developers like you at Mozilla's View Source conference, 12-14 September in Berlin, Germany. Learn more at


This article needs a technical review. How you can help.

Type is a characteristic of a value affecting which operations on that value are valid. For example, an integer can be multiplied by an integer, but not by a string.

Learn more

General knowledge

Document Tags and Contributors

 Contributors to this page: hbloomer, Andrew_Pfeiffer
 Last updated by: hbloomer,