JavaScript String padStart()

Definition and usage

padStart() The method is used to pad characters at the beginning of the string.

padStart() The method uses another string (repeated multiple times) to pad the current string until it reaches the specified length.

Also see:

padEnd() method

trim() method

trimEnd() method

trimStart() method

Instance

Example 1

Pad the string with "0" until its length reaches 4:

let text = "5";
let padded = text.padStart(4,"0");

Try it yourself

Example 2

Pad the string with "x" until its length reaches 4:

let text = "5";
let padded = text.padStart(4,"x");

Try it yourself

Example 3

let numb = 5;
let text = numb.toString();
let padded = text.padStart(4,"0");

Try it yourself

Syntax

string.padStart(length, string)

Parameter

Return value

Browser support

padStart() It is a feature of ECMAScript 2017.

Since September 2017, all modern browsers support ES2017:

Internet Explorer does not support padStart().