Web Reference: Jan 8, 2026 · The typeof operator returns a string indicating the type of the operand's value. The typeof operator returns the data type of a JavaScript variable. In JavaScript, a primitive value is a single value with no properties or methods. JavaScript has 7 primitive data types: The typeof operator returns the type of a variable or an expression. In JavaScript, null is a primitive value. However, typeof returns object. In this tutorial, you'll learn how to use the JavaScript typeof operator that returns a string representing the type of a value.
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