---
title: Control which routes invoke your Worker script for Single Page
  Applications · Changelog
description: New configuration options for specifying which routes invoke your
  Worker script.
chatbotDeprioritize: true
source_url:
  html: https://developers.cloudflare.com/changelog/2025-06-17-advanced-routing/
  md: https://developers.cloudflare.com/changelog/2025-06-17-advanced-routing/index.md
---

# Changelog

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## Control which routes invoke your Worker script for Single Page Applications

Jun 17, 2025

[Workers](https://developers.cloudflare.com/workers/)

For those building [Single Page Applications (SPAs) on Workers](https://developers.cloudflare.com/workers/static-assets/routing/single-page-application/#advanced-routing-control), you can now explicitly define which routes invoke your Worker script in Wrangler configuration. The [`run_worker_first` config option](https://developers.cloudflare.com/workers/static-assets/binding/#run_worker_first) has now been expanded to accept an array of route patterns, allowing you to more granularly specify when your Worker script runs.

**Configuration example:**

* wrangler.jsonc

  ```jsonc
  {
    "name": "my-spa-worker",
    "compatibility_date": "2025-10-22",
    "main": "./src/index.ts",
    "assets": {
      "directory": "./dist/",
      "not_found_handling": "single-page-application",
      "binding": "ASSETS",
      "run_worker_first": ["/api/*", "!/api/docs/*"]
    }
  }
  ```

* wrangler.toml

  ```toml
  name = "my-spa-worker"
  compatibility_date = "2025-10-22"
  main = "./src/index.ts"


  [assets]
  directory = "./dist/"
  not_found_handling = "single-page-application"
  binding = "ASSETS"
  run_worker_first = [ "/api/*", "!/api/docs/*" ]
  ```

This new routing control was done in partnership with our community and customers who provided great feedback on [our public proposal](https://github.com/cloudflare/workers-sdk/discussions/9143). Thank you to everyone who brought forward use-cases and feedback on the design!

#### Prerequisites

To use advanced routing control with `run_worker_first`, you'll need:

* [Wrangler](https://developers.cloudflare.com/workers/wrangler/install-and-update/) v4.20.0 and above
* [Cloudflare Vite plugin](https://developers.cloudflare.com/workers/vite-plugin/get-started/) v1.7.0 and above
