Web Reference: Declaring JavaScript Variables Creating a variable in JavaScript is called declaring a variable. You declare a JavaScript variable with the let keyword or the const keyword. Jan 19, 2026 · Variables in JavaScript are used to store data values. They can be declared in different ways depending on how the value should behave. JavaScript is dynamically typed, so types are decided at runtime. You don’t need to specify a data type when creating a variable. In this tutorial, you'll learn about JavaScript variables and how to use variables to store values in the application.
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