Web Reference: Jan 8, 2026 · The typeof operator returns a string indicating the type of the operand's value. An expression representing the object or primitive whose type is to be returned. The following table summarizes the possible return values of typeof. For more information about types and primitives, see also the JavaScript data structure page. 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. Dec 13, 2024 · The typeof operator in JavaScript is used to determine the data type of a value or variable. It returns a string indicating the type, such as "string", "number", "boolean", "object", etc.
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