How to read nextjs server action function name and parameters in middleware?

[amplicity]

When server actions are called, they manifest as a POST request from the user's current route. I'm trying to get information about the function name and params in middleware

export default async function middleware(request: NextRequest) {
  console.log('request', request)
}

When I inspect request, I find no references to the function name or the params passed, but i'm only crudely inspecting and haven't ruled out serialization. Is there a way to view the server action's function name and parameters that called the POST route?

[Juneezee]

I'm afraid no.

Next.js identifies the server action through the Next-Action header. You can see a demonstration in this Youtube video: https://youtu.be/mwNZ34sxIGw?t=293

[amplicity]

Thank you, have been looking for a reference like you shared.

[amplicity]

Do you know of any way to reference/decode that id to something meaningful?

[Juneezee]

Do you know of any way to reference/decode that id to something meaningful?

I'm sorry to disappoint you. All I know is that Next.js generates a unique ID for each Server Action on build time. I didn't delve in Next.js source code to understand how the ID works internally.

Also, Next.js could be adding salt in the future so rebuilds won't produce the same IDs anymore, see #63804 (comment).

We're also adding hash salt rotation to production build, so rebuilds will be protected in this case and all ids will change.

So unless Next.js is willing to provide us a way to identify the Server Action through the Next-Action header, I don't see a reliable way of doing it using hacks.