---
title: Rewrite links on HTML pages
description: Dynamically rewrite links in HTML responses. This is useful for site migrations and branding updates.
image: https://developers.cloudflare.com/core-services-preview.png
---

> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/rules/llms.txt  
> Use this file to discover all available pages before exploring further. 

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# Rewrite links on HTML pages

Dynamically rewrite links in HTML responses.

JavaScript

```
export default {  async fetch(request) {    // Define the old hostname here.    const OLD_URL = "oldsite.com";    // Then add your new hostname that should replace the old one.    const NEW_URL = "newsite.com";
    class AttributeRewriter {      constructor(attributeName) {        this.attributeName = attributeName;      }      element(element) {        const attribute = element.getAttribute(this.attributeName);        if (attribute) {          element.setAttribute(            this.attributeName,            attribute.replace(OLD_URL, NEW_URL),          );        }      }    }
    const rewriter = new HTMLRewriter()      .on("a", new AttributeRewriter("href"))      .on("img", new AttributeRewriter("src"));
    const res = await fetch(request);    if (!res.headers.has("Content-Type")) {      return res;    }    const contentType = res.headers.get("Content-Type");    if (typeof contentType !== "string") {      return res;    }
    // If the response is HTML, it can be transformed with    // HTMLRewriter -- otherwise, it should pass through    if (contentType.startsWith("text/html")) {      return rewriter.transform(res);    } else {      return res;    }  },};
```

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```