How to convert a string representation of an integer number to number type in JavaScript?

Published November 13, 2020

To convert a string representation of an integer number to a number type, you can use the parseInt() function in JavaScript.

Consider this string of integer number,

// string with integer number
const str = "45";

Let's use the parseInt() function and pass the string to the function as an argument to convert it to a number type like this,

// string with integer number
const str = "45";

// convert to number type
const intNum = parseInt(str);

console.log(intNum); // 45
  • This function is useful when you want to convert values that are obtained from url, form, or whichever places where the values will be string type and need to be converted to an integer number.

See this example live in JSBin.

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