@kakang/fastify-multipart

This plugin is used to replace fastify-formidable and fastify-busboy. It provides a generic API which allows users to not only using formidable or busboy for parsing multipart/form-data, but provide custom adapter for parsing and custom storage engine to handle file stream. You may also try the async iterator same as @fastify/multipart for advanced usage.

You can checkout @fastify/multipart if you prefer offcial plugin.

Install

npm install @kakang/fastify-multipart --save

yarn add @kakang/fastify-multipart

// For BusboyAdapter
npm install busboy --save

yarn add busboy

// For FormidableAdapter
npm install formidable --save

yarn add formidable

Usage

import FastifyMultipart from '@kakang/fastify-multipart'
import { BusboyAdapter } from '@kakang/fastify-multipart/lib/adapter/busboy'
import { FileStorage } from '@kakang/fastify-multipart/lib/storage/file'
import { BufferStorage } from '@kakang/fastify-multipart/lib/storage/buffer'

fastify.register(FastifyMultipart, {
  adapter: BusboyAdapter,
  storage: FileStorage,
  storageOption: {
    uploadDir: '/'
  }
})

fastify.post('/', async function(request, reply) {
  // you need to call the parser if you do not pass any option through plugin registration
  await request.parseMultipart()

  // you can use async iterator for file handling
  for await (const { type, name, value, info } of request.multipart()) {
    switch(type) {
      case 'field': {
        console.log(name, value)
        break
      }
      case 'file': {
        console.log(name, value, info.filename)
        // value is Readable
        value.resume()
        break
      }
    }
  }

  // you can use FormData if you familiar with Web API
  for await (const [name, value] of await request.formData()) {
    console.log(name, value)
  }


  // access files
  request.files

  // access body
  // note that file fields will exist in body and it will becomes the file path saved on disk
  request.body

  // check if it is multipart
  if(request[kIsMultipart] === true) {}

  // check if it is already parsed
  if (request[kIsMultipartParsed] === true) {}
})


// add content type parser which will automatic parse all `multipart/form-data` found
fastify.register(FastifyBusboy, {
  addContentTypeParser: true,
  adapter: BusboyAdapter,
  storage: BufferStorage
})

// add `preValidation` hook which will automatic parse all `multipart/form-data` found
fastify.register(FastifyBusboy, {
  addHooks: true,
  adapter: BusboyAdapter,
  storage: BufferStorage
})

Options

options.adapter

The option for content type parser adapter. By default, we provide BusboyAdapter and FormidableAdapter. You may also extends Adapter and built your own one.

import FastifyMultipart from '@kakang/fastify-multipart'
import { Adapter } from '@kakang/fastify-multipart/lib/adapter/adapter'
import { BusboyAdapter } from '@kakang/fastify-multipart/lib/adapter/busboy'
import { FormidableAdapter } from '@kakang/fastify-multipart/lib/adapter/formidable'
import { BufferStorage } from '@kakang/fastify-multipart/lib/storage/buffer'

fastify.register(FastifyBusboy, {
  adapter: BusboyAdapter,
  storage: BufferStorage,
})

options.storage

The option for storage engine. By default, we provide FileStorage and BufferStorage. You may also extends Storage and built your own one.

import FastifyMultipart from '@kakang/fastify-multipart'
import { BusboyAdapter } from '@kakang/fastify-multipart/lib/adapter/busboy'
import { Storage } from '@kakang/fastify-multipart/lib/storage/storage'
import { BufferStorage } from '@kakang/fastify-multipart/lib/storage/buffer'
import { FileStorage } from '@kakang/fastify-multipart/lib/storage/file'

fastify.register(FastifyBusboy, {
  adapter: BusboyAdapter,
  storage: MemoryStorage,
})

options.removeFilesFromBody

This options will not add any files fields to body when enabled.

import FastifyMultipart from '@kakang/fastify-multipart'
import { BusboyAdapter } from '@kakang/fastify-multipart/lib/adapter/busboy'
import { BufferStorage } from '@kakang/fastify-multipart/lib/storage/buffer'

fastify.register(FastifyBusboy, {
  adapter: BusboyAdapter,
  storage: BufferStorage,
  removeFilesFromBody: true
})