URL

`URL.prototype.hash`

Returns or sets the fragment identifier of the URL including the leading hash character

Syntax

JavaScript

url.hash

Return Value

A string containing the fragment (hash), or empty string

Examples

Basic Usage

const url = new URL('https://example.com/page#section-2')
console.log(url.hash) // '#section-2'

Practical Example

const url = new URL('https://example.com/docs')
url.hash = '#getting-started'
console.log(url.href)

Advanced Usage

function getAnchor(urlStr: string): string {
  const hash = new URL(urlStr).hash
  return hash ? hash.slice(1) : ''
}

Understanding URL.prototype.hash

The URL.prototype.hash method in JavaScript returns or sets the fragment identifier of the URL including the leading hash character. It belongs to the URL object and is one of the most widely used methods for working with url values in modern JavaScript and TypeScript applications.

The method signature is url.hash. When called, it returns a string containing the fragment (hash), or empty string. Understanding when and how to use hash() helps you write more expressive, readable code.

Common use cases for URL.prototype.hash include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like url-search, url-pathname, url-href, enabling you to chain operations together for complex data manipulation pipelines.

Browser support for URL.prototype.hash is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. It is also fully supported in Node.js and Deno. For older environments, transpilation with Babel or a polyfill may be needed.