---
title: Remove query strings before sending request to origin
description: Remove certain query strings from a request before passing to the origin.
image: https://developers.cloudflare.com/core-services-preview.png
---

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# Remove query strings before sending request to origin

Remove certain query strings from a request before passing to the origin.

JavaScript

```
export default {  async fetch(request) {    // Define the query strings you want to remove    const queryStringsToRemove = ["utm_source", "utm_medium", "utm_campaign"];
    // Get the URL from the request    const url = new URL(request.url);
    // Remove the specified query strings    queryStringsToRemove.forEach((query) => {      url.searchParams.delete(query);    });
    // Create a new request with the modified URL    const modifiedRequest = new Request(url, request);
    // Pass the modified request to the origin    const response = await fetch(modifiedRequest);
    return response;  },};
```

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```