how to use formidable with nuxt 3?

[mihail727]

i'm trying to upload pdf document from client side to server and then save it locally.
what i have:

---

• files:

client side @/pages/upload.vue

<script setup lang="ts">
	const onChange = async (e: Event) => {
		const { data, file, open } = useFileSystemAccess({ dataType: 'Blob' });

		await open();

		const formData = new FormData();
		formData.append('file', data.value);

		await useAsyncData('file', () =>
			$fetch('/api/upload/image', {
				method: 'POST',
				body: formData,
				headers: {
					'content-type': 'multipart/form-data',
				},
			}),
		);
	};
</script>

<template>
	<div>
		<button @click="onChange">Click</button>
	</div>
</template>

server side @/server/api/upload.ts

import { createApp, createRouter, useBody } from 'h3';
import formidable from 'formidable';

const app = createApp();
const router = createRouter();

app.use(router);

router.post('/image', async (req, res): Promise<IServerResponse<any>> => {
	try {
		const file = await useBody<Blob>(req);

		const form = formidable({});
		form.parse(req, (e, flds, files) => {
			console.log(e);
		});

		return { success: true };
	} catch (e) {
		return { success: false, reason: e.message };
	}
});

export default app;

---

• outputs:

req

IncomingMessage {
 _readableState: ReadableState {
   objectMode: false,
   highWaterMark: 16384,
   buffer: BufferList { head: null, tail: null, length: 0 },
   length: 0,
   pipes: [],
   flowing: true,
   ended: true,
   endEmitted: true,
   reading: false,
   constructed: true,
   sync: false,
   needReadable: false,
   emittedReadable: false,
   readableListening: false,
   resumeScheduled: false,
   errorEmitted: false,
   emitClose: true,
   autoDestroy: true,
   destroyed: true,
   errored: null,
   closed: true,
   closeEmitted: true,
   defaultEncoding: 'utf8',
   awaitDrainWriters: null,
   multiAwaitDrain: false,
   readingMore: false,
   dataEmitted: true,
   decoder: null,
   encoding: null,
   [Symbol(kPaused)]: false
 },
 _events: [Object: null prototype] {
   end: [ [Function: clearRequestTimeout], [Function (anonymous)] ],
   error: [Function (anonymous)],
   data: [Function (anonymous)]
 },
 _eventsCount: 3,
 _maxListeners: undefined,
 socket: <ref *1> Socket {
   connecting: false,
   _hadError: false,
   _parent: null,
   _host: null,
   _readableState: ReadableState {
     objectMode: false,
     highWaterMark: 16384,
     buffer: BufferList { head: null, tail: null, length: 0 },
     length: 0,
     pipes: [],
     flowing: true,
     ended: false,
     endEmitted: false,
     reading: true,
     constructed: true,
     sync: false,
     needReadable: true,
     emittedReadable: false,
     readableListening: false,
     resumeScheduled: false,
     errorEmitted: false,
     emitClose: false,
     autoDestroy: true,
     destroyed: false,
     errored: null,
     closed: false,
     closeEmitted: false,
     defaultEncoding: 'utf8',
     awaitDrainWriters: null,
     multiAwaitDrain: false,
     readingMore: false,
     dataEmitted: false,
     decoder: null,
     encoding: null,
     [Symbol(kPaused)]: false
   },
   _events: [Object: null prototype] {
     end: [Array],
     timeout: [Function: socketOnTimeout],
     data: [Function: bound socketOnData],
     error: [Function: socketOnError],
     close: [Array],
     drain: [Function: bound socketOnDrain],
     resume: [Function: onSocketResume],
     pause: [Function: onSocketPause]
   },
   _eventsCount: 8,
   _maxListeners: undefined,
   _writableState: WritableState {
     objectMode: false,
     highWaterMark: 16384,
     finalCalled: false,
     needDrain: false,
     ending: false,
     ended: false,
     finished: false,
     destroyed: false,
     decodeStrings: false,
     defaultEncoding: 'utf8',
     length: 0,
     writing: false,
     corked: 0,
     sync: true,
     bufferProcessing: false,
     onwrite: [Function: bound onwrite],
     writecb: null,
     writelen: 0,
     afterWriteTickInfo: null,
     buffered: [],
     bufferedIndex: 0,
     allBuffers: true,
     allNoop: true,
     pendingcb: 0,
     constructed: true,
     prefinished: false,
     errorEmitted: false,
     emitClose: false,
     autoDestroy: true,
     errored: null,
     closed: false,
     closeEmitted: false,
     [Symbol(kOnFinished)]: []
   },
   allowHalfOpen: true,
   _sockname: null,
   _pendingData: null,
   _pendingEncoding: '',
   server: Server {
     maxHeaderSize: undefined,
     insecureHTTPParser: undefined,
     _events: [Object: null prototype],
     _eventsCount: 2,
     _maxListeners: undefined,
     _connections: 1,
     _handle: [Pipe],
     _usingWorkers: false,
     _workers: [],
     _unref: false,
     allowHalfOpen: true,
     pauseOnConnect: false,
     httpAllowHalfOpen: false,
     timeout: 0,
     keepAliveTimeout: 5000,
     maxHeadersCount: null,
     maxRequestsPerSocket: 0,
     headersTimeout: 60000,
     requestTimeout: 0,
     _pipeName: '/tmp/nitro/worker-6284-134.sock',
     _connectionKey: '-1:/tmp/nitro/worker-6284-134.sock:-1',
     [Symbol(IncomingMessage)]: [Function: IncomingMessage],
     [Symbol(ServerResponse)]: [Function: ServerResponse],
     [Symbol(kCapture)]: false,
     [Symbol(async_id_symbol)]: 3896
   },
   _server: Server {
     maxHeaderSize: undefined,
     insecureHTTPParser: undefined,
     _events: [Object: null prototype],
     _eventsCount: 2,
     _maxListeners: undefined,
     _connections: 1,
     _handle: [Pipe],
     _usingWorkers: false,
     _workers: [],
     _unref: false,
     allowHalfOpen: true,
     pauseOnConnect: false,
     httpAllowHalfOpen: false,
     timeout: 0,
     keepAliveTimeout: 5000,
     maxHeadersCount: null,
     maxRequestsPerSocket: 0,
     headersTimeout: 60000,
     requestTimeout: 0,
     _pipeName: '/tmp/nitro/worker-6284-134.sock',
     _connectionKey: '-1:/tmp/nitro/worker-6284-134.sock:-1',
     [Symbol(IncomingMessage)]: [Function: IncomingMessage],
     [Symbol(ServerResponse)]: [Function: ServerResponse],
     [Symbol(kCapture)]: false,
     [Symbol(async_id_symbol)]: 3896
   },
   parser: HTTPParser {
     '0': [Function: bound setRequestTimeout],
     '1': [Function: parserOnHeaders],
     '2': [Function: parserOnHeadersComplete],
     '3': [Function: parserOnBody],
     '4': [Function: parserOnMessageComplete],
     '5': [Function: bound onParserExecute],
     '6': [Function: bound onParserTimeout],
     _headers: [],
     _url: '',
     socket: [Circular *1],
     incoming: [Circular *2],
     outgoing: null,
     maxHeaderPairs: 2000,
     _consumed: true,
     onIncoming: [Function: bound parserOnIncoming],
     [Symbol(resource_symbol)]: [HTTPServerAsyncResource]
   },
   on: [Function: socketListenerWrap],
   addListener: [Function: socketListenerWrap],
   prependListener: [Function: socketListenerWrap],
   setEncoding: [Function: socketSetEncoding],
   _paused: false,
   _httpMessage: ServerResponse {
     _events: [Object: null prototype],
     _eventsCount: 3,
     _maxListeners: undefined,
     outputData: [],
     outputSize: 0,
     writable: true,
     destroyed: false,
     _last: false,
     chunkedEncoding: false,
     shouldKeepAlive: false,
     maxRequestsOnConnectionReached: false,
     _defaultKeepAlive: true,
     useChunkedEncodingByDefault: true,
     sendDate: true,
     _removedConnection: false,
     _removedContLen: false,
     _removedTE: false,
     _contentLength: null,
     _hasBody: true,
     _trailer: '',
     finished: false,
     _headerSent: false,
     _closed: false,
     socket: [Circular *1],
     _header: null,
     _keepAliveTimeout: 5000,
     _onPendingData: [Function: bound updateOutgoingData],
     req: [Circular *2],
     _sent100: false,
     _expect_continue: false,
     end: [Function (anonymous)],
     [Symbol(kCapture)]: false,
     [Symbol(kNeedDrain)]: false,
     [Symbol(corked)]: 0,
     [Symbol(kOutHeaders)]: null
   },
   [Symbol(async_id_symbol)]: 7545,
   [Symbol(kHandle)]: Pipe {
     reading: true,
     _consumed: true,
     [Symbol(owner_symbol)]: [Circular *1]
   },
   [Symbol(kSetNoDelay)]: false,
   [Symbol(lastWriteQueueSize)]: 0,
   [Symbol(timeout)]: null,
   [Symbol(kBuffer)]: null,
   [Symbol(kBufferCb)]: null,
   [Symbol(kBufferGen)]: null,
   [Symbol(kCapture)]: false,
   [Symbol(kBytesRead)]: 0,
   [Symbol(kBytesWritten)]: 0,
   [Symbol(RequestTimeout)]: undefined
 },
 httpVersionMajor: 1,
 httpVersionMinor: 1,
 httpVersion: '1.1',
 complete: true,
 rawHeaders: [
   'cookie',
   'access=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VySUQiOjEsIm5hbWUiOnsiZmlyc3QiOiLQndC40LrQuNGC0LjQvSIsInNlY29uZCI6ItCc0LjRhdCw0LjQuyJ9LCJhZG1pbiI6dHJ1ZSwiaWF0IjoxNjQ4ODA5NDI2LCJleHAiOjE2NDg4MDk0NDF9.IkJzNKLn-XCWhJhw2IGPM7RmBFK-2FrZCxp2wdBju2E',
   'accept-language',
   'en-US,en;q=0.9,ru;q=0.8',
   'accept-encoding',
   'gzip, deflate, br',
   'referer',
   'http://localhost:3000/upload',
   'sec-fetch-dest',
   'empty',
   'sec-fetch-mode',
   'cors',
   'sec-fetch-site',
   'same-origin',
   'origin',
   'http://localhost:3000',
   'accept',
   '*/*',
   'content-type',
   'multipart/form-data',
   'sec-ch-ua-platform',
   '"Linux"',
   'user-agent',
   'Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.60 Safari/537.36',
   'sec-ch-ua-mobile',
   '?0',
   'dnt',
   '1',
   'sec-ch-ua',
   '" Not A;Brand";v="99", "Chromium";v="100", "Google Chrome";v="100"',
   'content-length',
   '7610',
   'connection',
   'close',
   'host',
   'localhost:3000'
 ],
 rawTrailers: [],
 aborted: false,
 upgrade: false,
 url: '/image',
 method: 'POST',
 statusCode: null,
 statusMessage: null,
 client: <ref *1> Socket {
   connecting: false,
   _hadError: false,
   _parent: null,
   _host: null,
   _readableState: ReadableState {
     objectMode: false,
     highWaterMark: 16384,
     buffer: BufferList { head: null, tail: null, length: 0 },
     length: 0,
     pipes: [],
     flowing: true,
     ended: false,
     endEmitted: false,
     reading: true,
     constructed: true,
     sync: false,
     needReadable: true,
     emittedReadable: false,
     readableListening: false,
     resumeScheduled: false,
     errorEmitted: false,
     emitClose: false,
     autoDestroy: true,
     destroyed: false,
     errored: null,
     closed: false,
     closeEmitted: false,
     defaultEncoding: 'utf8',
     awaitDrainWriters: null,
     multiAwaitDrain: false,
     readingMore: false,
     dataEmitted: false,
     decoder: null,
     encoding: null,
     [Symbol(kPaused)]: false
   },
   _events: [Object: null prototype] {
     end: [Array],
     timeout: [Function: socketOnTimeout],
     data: [Function: bound socketOnData],
     error: [Function: socketOnError],
     close: [Array],
     drain: [Function: bound socketOnDrain],
     resume: [Function: onSocketResume],
     pause: [Function: onSocketPause]
   },
   _eventsCount: 8,
   _maxListeners: undefined,
   _writableState: WritableState {
     objectMode: false,
     highWaterMark: 16384,
     finalCalled: false,
     needDrain: false,
     ending: false,
     ended: false,
     finished: false,
     destroyed: false,
     decodeStrings: false,
     defaultEncoding: 'utf8',
     length: 0,
     writing: false,
     corked: 0,
     sync: true,
     bufferProcessing: false,
     onwrite: [Function: bound onwrite],
     writecb: null,
     writelen: 0,
     afterWriteTickInfo: null,
     buffered: [],
     bufferedIndex: 0,
     allBuffers: true,
     allNoop: true,
     pendingcb: 0,
     constructed: true,
     prefinished: false,
     errorEmitted: false,
     emitClose: false,
     autoDestroy: true,
     errored: null,
     closed: false,
     closeEmitted: false,
     [Symbol(kOnFinished)]: []
   },
   allowHalfOpen: true,
   _sockname: null,
   _pendingData: null,
   _pendingEncoding: '',
   server: Server {
     maxHeaderSize: undefined,
     insecureHTTPParser: undefined,
     _events: [Object: null prototype],
     _eventsCount: 2,
     _maxListeners: undefined,
     _connections: 1,
     _handle: [Pipe],
     _usingWorkers: false,
     _workers: [],
     _unref: false,
     allowHalfOpen: true,
     pauseOnConnect: false,
     httpAllowHalfOpen: false,
     timeout: 0,
     keepAliveTimeout: 5000,
     maxHeadersCount: null,
     maxRequestsPerSocket: 0,
     headersTimeout: 60000,
     requestTimeout: 0,
     _pipeName: '/tmp/nitro/worker-6284-134.sock',
     _connectionKey: '-1:/tmp/nitro/worker-6284-134.sock:-1',
     [Symbol(IncomingMessage)]: [Function: IncomingMessage],
     [Symbol(ServerResponse)]: [Function: ServerResponse],
     [Symbol(kCapture)]: false,
     [Symbol(async_id_symbol)]: 3896
   },
   _server: Server {
     maxHeaderSize: undefined,
     insecureHTTPParser: undefined,
     _events: [Object: null prototype],
     _eventsCount: 2,
     _maxListeners: undefined,
     _connections: 1,
     _handle: [Pipe],
     _usingWorkers: false,
     _workers: [],
     _unref: false,
     allowHalfOpen: true,
     pauseOnConnect: false,
     httpAllowHalfOpen: false,
     timeout: 0,
     keepAliveTimeout: 5000,
     maxHeadersCount: null,
     maxRequestsPerSocket: 0,
     headersTimeout: 60000,
     requestTimeout: 0,
     _pipeName: '/tmp/nitro/worker-6284-134.sock',
     _connectionKey: '-1:/tmp/nitro/worker-6284-134.sock:-1',
     [Symbol(IncomingMessage)]: [Function: IncomingMessage],
     [Symbol(ServerResponse)]: [Function: ServerResponse],
     [Symbol(kCapture)]: false,
     [Symbol(async_id_symbol)]: 3896
   },
   parser: HTTPParser {
     '0': [Function: bound setRequestTimeout],
     '1': [Function: parserOnHeaders],
     '2': [Function: parserOnHeadersComplete],
     '3': [Function: parserOnBody],
     '4': [Function: parserOnMessageComplete],
     '5': [Function: bound onParserExecute],
     '6': [Function: bound onParserTimeout],
     _headers: [],
     _url: '',
     socket: [Circular *1],
     incoming: [Circular *2],
     outgoing: null,
     maxHeaderPairs: 2000,
     _consumed: true,
     onIncoming: [Function: bound parserOnIncoming],
     [Symbol(resource_symbol)]: [HTTPServerAsyncResource]
   },
   on: [Function: socketListenerWrap],
   addListener: [Function: socketListenerWrap],
   prependListener: [Function: socketListenerWrap],
   setEncoding: [Function: socketSetEncoding],
   _paused: false,
   _httpMessage: ServerResponse {
     _events: [Object: null prototype],
     _eventsCount: 3,
     _maxListeners: undefined,
     outputData: [],
     outputSize: 0,
     writable: true,
     destroyed: false,
     _last: false,
     chunkedEncoding: false,
     shouldKeepAlive: false,
     maxRequestsOnConnectionReached: false,
     _defaultKeepAlive: true,
     useChunkedEncodingByDefault: true,
     sendDate: true,
     _removedConnection: false,
     _removedContLen: false,
     _removedTE: false,
     _contentLength: null,
     _hasBody: true,
     _trailer: '',
     finished: false,
     _headerSent: false,
     _closed: false,
     socket: [Circular *1],
     _header: null,
     _keepAliveTimeout: 5000,
     _onPendingData: [Function: bound updateOutgoingData],
     req: [Circular *2],
     _sent100: false,
     _expect_continue: false,
     end: [Function (anonymous)],
     [Symbol(kCapture)]: false,
     [Symbol(kNeedDrain)]: false,
     [Symbol(corked)]: 0,
     [Symbol(kOutHeaders)]: null
   },
   [Symbol(async_id_symbol)]: 7545,
   [Symbol(kHandle)]: Pipe {
     reading: true,
     _consumed: true,
     [Symbol(owner_symbol)]: [Circular *1]
   },
   [Symbol(kSetNoDelay)]: false,
   [Symbol(lastWriteQueueSize)]: 0,
   [Symbol(timeout)]: null,
   [Symbol(kBuffer)]: null,
   [Symbol(kBufferCb)]: null,
   [Symbol(kBufferGen)]: null,
   [Symbol(kCapture)]: false,
   [Symbol(kBytesRead)]: 0,
   [Symbol(kBytesWritten)]: 0,
   [Symbol(RequestTimeout)]: undefined
 },
 _consuming: true,
 _dumped: false,
 originalUrl: '/api/upload/image',
 params: {},
 [Symbol(kCapture)]: false,
 [Symbol(kHeaders)]: {
   cookie: 'access=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VySUQiOjEsIm5hbWUiOnsiZmlyc3QiOiLQndC40LrQuNGC0LjQvSIsInNlY29uZCI6ItCc0LjRhdCw0LjQuyJ9LCJhZG1pbiI6dHJ1ZSwiaWF0IjoxNjQ4ODA5NDI2LCJleHAiOjE2NDg4MDk0NDF9.IkJzNKLn-XCWhJhw2IGPM7RmBFK-2FrZCxp2wdBju2E',
   'accept-language': 'en-US,en;q=0.9,ru;q=0.8',
   'accept-encoding': 'gzip, deflate, br',
   referer: 'http://localhost:3000/upload',
   'sec-fetch-dest': 'empty',
   'sec-fetch-mode': 'cors',
   'sec-fetch-site': 'same-origin',
   origin: 'http://localhost:3000',
   accept: '*/*',
   'content-type': 'multipart/form-data',
   'sec-ch-ua-platform': '"Linux"',
   'user-agent': 'Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.60 Safari/537.36',
   'sec-ch-ua-mobile': '?0',
   dnt: '1',
   'sec-ch-ua': '" Not A;Brand";v="99", "Chromium";v="100", "Google Chrome";v="100"',
   'content-length': '7610',
   connection: 'close',
   host: 'localhost:3000'
 },
 [Symbol(kHeadersCount)]: 36,
 [Symbol(kTrailers)]: null,
 [Symbol(kTrailersCount)]: 0,
 [Symbol(RequestTimeout)]: undefined,
 [Symbol(h3RawBody)]: Promise {
   <Buffer 2d 2d 2d 2d 2d 2d 57 65 62 4b 69 74 46 6f 72 6d 42 6f 75 6e 64 61 72 79 43 58 57 72 38 51 6b 55 68 41 59 51 6c 49 45 61 0d 0a 43 6f 6e 74 65 6e 74 2d ... 7560 more bytes>,
   [Symbol(async_id_symbol)]: 7567,
   [Symbol(trigger_async_id_symbol)]: 7561,
   [Symbol(destroyed)]: { destroyed: false }
 },
 [Symbol(h3RawBody)]: '------WebKitFormBoundaryCXWr8QkUhAYQlIEa\r\n' +
   'Content-Disposition: form-data; name="file"; filename="zayavlenie.pdf"\r\n' +
   'Content-Type: application/pdf\r\n' +
   '\r\n' +
   '%PDF-1.6\n' +
   '%äüöß\n' +
   '2 0 obj\n' +
   '<</Length 3 0 R/Filter/FlateDecode>>\n' +
   'stream\n' +
   'x�%ʻ\n' +
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   'endstream\n' +
   'endobj\n' +
   '\n' +
   '3 0 obj\n' +
   '115\n' +
   'endobj\n' +
   '\n' +
   '5 0 obj\n' +
   '<</Length 6 0 R/Filter/FlateDecode/Length1 9068>>\n' +
   'stream\n' +
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}

const file

contains the same value as req[Symbol(h3RawBody)]

---

• errors:

output error inside form.parse(req, (error))

FormidableError: bad content-type header, no multipart boundary ...

---

• questions:
  • is it possible to directly parse file and not req?

[GrosSacASac]

Use formidable or useBody but not both at the same time. Do not manually set the content type header in fetch, it will be done for you.

is it possible to directly parse file and not req?

No

[mihail727]

god dam u right ... i just remove row with useBody and all works