Question: TypeError: Missing parameter name at 1: https://git.new/pathToRegexpError when running combined React+Docusaurus server setup

[kd-akshay]

Hello,

I'm building an npm package that bootstraps a project with both a React application (either with Vite or Webpack) and a Docusaurus documentation site, served from a single Express server (generated programmatically via scripts).

The entry point is index.js, which triggers my node script and generates a server.mjs file inside a target directory that combines both apps.

However, when I run the generated server (server.mjs), I get the following error:

TypeError: Missing parameter name at 1: https://git.new/pathToRegexpError
    at name (path-to-regexp/dist/index.js:73:19)

The full stack trace points to the usage of the path-to-regexp module inside Express routing logic, suggesting that one of the paths being registered is malformed.

What I’ve checked:

• Verified that all route paths passed to app.use() in the generated server.mjs are valid strings.
  

• Confirmed that neither React nor Docusaurus configs have wildcards or colons (:) that might confuse path-to-regexp.
  

• Checked if paths are being passed as empty strings or incomplete fragments.
  

My Questions:

• Is this error from path-to-regexp due to an invalid string being passed as a route in one of the middlewares?

• Does Docusaurus use dynamic routing that might interfere with express.use() when serving both Docusaurus and Vite/Webpack together?

• Is there a known conflict when serving Vite middleware and a built Docusaurus site under the same server instance?

• How can I validate the route strings before they're passed to Express?

Any guidance on how to avoid this route-related error when combining Docusaurus and Vite/Webpack in a single server file would be appreciated!

Thanks in advance 🙏

[slorber]

Hey, this is really impossible to help you on this.

I'd suggest hardcoding things instead of generating code, and then use a debugger to see which bad input the library get and why, but that's clearly out of the scope of Docusaurus.

[MaxGitHub0515]

Huh, I ran into the same issue, thx for help😂

[kd-akshay]

Thanks @slorber for your response, really appreciate it!