node js check type of variable

1var foo = "Hello";
2console.log(typeof foo); // string

1if (typeof i != "number") {
2    console.log('This is not number');
3}

1// You can use the built-in method 'typeof' in order to check the variable datatype
2
3//examples:
4
5typeof "hello" // "string"
6
7//or
8var a = 1;
9typeof(a);
10//the output will be > 'number'