JavaScript (ES2026) reference · String Methods

JavaScript String startsWith() Method

Return true if the string begins with the given text. Case-sensitive; an optional position starts the check later.

JavaScript (ES2026) Since ES2015

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Syntax

string.startsWith(searchString, position)

Parameter	Description
`searchString`	Text to look for.
`position` optional	Index to check from. Default: `0`

true or false.

Check a prefixTry it yourself

const url = "https://www.readycamel.com";
console.log(url.startsWith("https://"), url.startsWith("http://"));

Output

true false

From a positionTry it yourself

console.log("ReadyCamel".startsWith("Camel", 5));

Output

true

Version	Change
JavaScript ES2015	Added

string.endsWith() · Return true if the string ends with the given text. Case-sensitive; an optional length treats the string as shorter.
string.includes() · Return true if the string contains the given text anywhere. Case-sensitive.
JavaScript Strings · tutorial
JavaScript String Methods · tutorial