Cloudflare Developers•2y ago

How to read FormData entry in CloudFlare?

CloudFlare Workers do not support the Blob or FileReader type. How can I read the 'body' of a multipart/form-data post ?

const formData = await request.formData();
const rawStream = formData.get("entry-name");
// how to get the string value of rawStream? .toString() yields [Object, object]

const formData = await request.formData();
const rawStream = formData.get("entry-name");
// how to get the string value of rawStream? .toString() yields [Object, object]

10 Replies

James•2y ago

Are you trying to upload files? Workers do support File: https://walshy.dev/blog/21_09_10-handling-file-uploads-with-cloudflare-workers Or perhaps some other kind of data?

joshtwistOP•2y ago

Yes. Actually, I've spotted the issue. We also use Deno which returns a File object when we call formData.get("entry-name"). However, CloudFlare returns a string which I was not expecting. Is this by design?

James•2y ago

Are you using a modern compatibility date? Prior to 2021-11-03, it returned a string: https://developers.cloudflare.com/workers/platform/compatibility-dates/#formdata-parsing-supports-file But as long as you're using a modern compat date (newer than 2021-11-03), that should no longer be the case

joshtwistOP•2y ago

ah, we may be on an old date wait, this worker is much newer than that

James•2y ago

You can also just enable that specific compat flag formdata_parser_supports_files, if you can't bump your compatibility date for whatever reason What compatability_date do you have in your wrangler.toml?

joshtwistOP•2y ago

I am just using quick edit right now

James•2y ago

Oh I see - yeah unfortunately quick edit doesn't specify a compat date so this won't work there You'll need to use wrangler to publish

joshtwistOP•2y ago

does quick edit use a super old compat date then? What's teh default?

James•2y ago

It doesn't set one as far as I know, which'll mean it just won't have any breaking changes from since when compat dates were first introduced in 2021

joshtwistOP•2y ago

got it, thanks James

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How to read FormData entry in CloudFlare?