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toString() in JavaScript – How to Convert Number to String

toString() converts a number to a string of a specified radix.

note

toString() is sometimes written as Number.prototype.toString() because it is a method of the Number object's prototype property.

Syntax of the toString() Method​

toString() accepts only one optional argument. Here is the syntax:

number.toString(radix);

The radix argument specifies the base into which you wish to convert the number.

note
  • Radix must be an integer between 2 and 36 inclusive. Otherwise, toString() will return an Uncaught RangeError.
  • Suppose you omit the radix argument. In that case, the computer will assume a radix of 10 (base ten).
  • Suppose you provide a negative number. In such a case, the computer will preserve the negative sign.

Examples of the toString() Method​

Below are examples of the toString() method.

Convert 45 to a decimal string​

(45).toString();

// The invocation above will return: "45"

Try Editing It

Note that the snippet above is equivalent to:

(45).toString(10);

// The invocation above will return: "45"

Try Editing It

info

We wrapped 45 in a grouping operator to make browsers interpret the dot correctly as a property accessor used to access the number's toString() method. Learn more about how browsers interpret a method's dot.

Convert 45 to a binary string​

(45).toString(2);

// The invocation above will return: "101101"

Try Editing It

Convert negative 45 to a binary string​

(-45).toString(2);

// The invocation above will return: "-101101"

Try Editing It

Convert 45 to an octal string​

(45).toString(8);

// The invocation above will return: "55"

Try Editing It

Convert 45 to a hexadecimal string​

(45).toString(16);

// The invocation above will return: "2d"

Try Editing It

Convert 45 to a vigesimal string​

(45).toString(20);

// The invocation above will return: "25"

Try Editing It

Overview​

This article discussed what toString() is. We also used examples to see how it works.

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