Koa: How to upload file in koa2?

[SteveCruise]

And most important, with a callback when upload finish, like jquery-file-upload-middleware in express.
Getting params is also needed.

[carlisliu]

koa upload example

[SteveCruise]

@carlisliu Thank you very much. But there should have a plugin to do that.

[fl0w]

@SteveCruise you mean like https://github.com/koa-modules/multer?

[SteveCruise]

@fl0w koa-better-body is based on Formidable to deal with file upload. But Formidable is hard to use. jquery-file-upload-middleware is based on Formidable and makes it easy but it's only for express. Multer is not the right one.

[SteveCruise]

Formidable is hard to deal with multiple upload.

[valVk]

here is another promise based file uploader I'm using that in my project
https://github.com/m4nuC/async-busboy

[chanlito]

I use koa multer and works pretty well.

[SteveCruise]

@BruceHem Yes， koa-multer is what I want, but it has little readme, I must read multer for express first.

[SteveCruise]

I summarize the best choise of koa2 middleware here.
koa-router --- for router and work with koa-multer
koa-multer --- for upload file
koa-bodyparser --- for parse json and form
koa-send --- for download file
koa-session --- for session
koa-sslify --- forced change to https
koa-favicon
koa-logger
koa-static

[SteveCruise]

@valVk Thank you very much.

[hirako2000]

I also had some struggle, thus wrote my own wrapper.

[crazyyi]

@valVk Thanks this one is really easy to use.

[haifahrul]

@crazyyi Hi, what the best of it for upload file? What should I use?

[std4453]

What can I use to upload files directly as binary stream? Like with AWS S3 (and minio)?

[gideaoms]

function store(ctx) {
    const form = new formidable.IncomingForm(...);
    form.parse(ctx.req, (err, fields, files) => {
        if (err) {
             ...
        }
        ...
    })
}

[nfantone]

Exactly my question, @std4453. I was trying to scavenge around, searching for a solution - but failed to find a single mention to that use case. multipart/form-data encoding only makes sense in the context of HTTP forms.

The way I usually go about this is using raw-body myself in a custom middleware and messing with the request body as a Buffer.