JavaScript (ES2026) reference · Number Methods and Properties

JavaScript number.toString() Method

Convert a number to a string, optionally in another base such as 2 (binary) or 16 (hexadecimal).

JavaScript (ES2026) Since ES1

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Syntax

number.toString(radix)

Parameter	Description
`radix` optional	Base from 2 to 36. Default: `10`

A string.

Different basesTry it yourself

const n = 255;
console.log(n.toString(), n.toString(2), n.toString(16), n.toString(36));

Output

255 11111111 ff 73

RGB to a hex colourTry it yourself

const hex = (r, g, b) => "#" + [r, g, b].map((v) => v.toString(16).padStart(2, "0")).join("");
console.log(hex(255, 140, 0));

Output

#ff8c00

Version	Change
JavaScript ES1	Added

Number.parseInt() · Parse an integer from the start of a string in a given base (radix). Always pass the radix, usually 10.
string.padStart() · Pad the start of a string until it reaches a target length, for example zero-padding numbers like 007.
JavaScript Numbers · tutorial
JavaScript Type Conversion · tutorial