mdn typeof code example

Example 1: check data type in javascript

typeof("string"); //string
typeof(123); //number

Example 2: javascript check type of variable var

// You can use the built-in method 'typeof' in order to check the variable datatype

//examples:

typeof "hello" // "string"

//or
var a = 1;
typeof(a);
//the output will be > 'number'

Example 3: how to get type of variable in javascript

> typeof "foo"
"string"
> typeof true
"boolean"
> typeof 42
"number"

Example 4: check data type in js

var x = "Hello World";
typeof x; // "string"