Astro Info

Astro                    v6.3.6
Node                     v24.13.0
System                   Linux (x64)
Package Manager          pnpm
Output                   server
Adapter                  @astrojs/node
Integrations             none

If this issue only occurs in one browser, which browser is a problem?

No response

Describe the Bug

(copied from the readme in my reproduction repo)

Astro seems to assume that if req.body exists, it's either a string, or it's been parsed by
some middleware from whichever server framework the IncomingMessage came from. See here

Serverless-http however, makes ctx.req.body a buffer. So it gets caught in the typeof req.body === 'object' clause. See here and here

So what ends up happening, is rather than the buffer just being passed through, it gets JSON-stringified, and the action payload ends up being {type: "Buffer", data: [...]}, which causes an AstroActionInputError.

What's the expected result?

Astro should have a branch to pass through buffers in makeRequestBody in packages/astro/src/core/app/node.ts

Link to Minimal Reproducible Example

https://github.com/james-yeoman/astro-node-serverless-bug

Participation

• I am willing to submit a pull request for this issue.