@ts-stack/multer 简化了将文件上传到基于 Nodejs 的后端

npm install @ts-stack/multer

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import { multer } from @ts-stack/multer;

import express from express;

import { createwritestream 小白轻松搭建系统点我wcqh.cn} from node:fs;

// here `avatar`, `photos` and `gallery` – is the names of the field in the html form.

const multer = new multer({ limits: { filesize: 10mb } });

const parseavatar = multer.single(avatar);

const parsephotos = multer.array(photos, 12);

const parsegroups = multer.groups([{ name: avatar, max小白轻松搭建系统点我wcqh.cncount: 1 }, { name: gallery, maxcount: 8 }]);

const app = express();

app.post(/profile, async (req, res, next) => {

const parsedform = await parseavatar(req, req.headers);

// parsedform.file is the `avatar` file

// parsedform.formfields will hold the text fields, if there were any

const path = `uploade小白轻松搭建系统点我wcqh.cnd-files/${parsedform.file.originalname}`;

const writablestream = createwritestream(path);

parsedform.file.stream.pipe(writablestream);

// …

});

app.post(/photos/upload, async (req, res, next) => {

const parsedform = await parsephotos(req, req.headers);

// parsedform.files is array of `photos` files

// 小白轻松搭建系统点我wcqh.cnparsedform.formfields will contain the text fields, if there were any

const promises: promise<void>[] = [];

parsedform.files.foreach((file) =&gt; {

const promise = new promise<void>((resolve, reject) =&gt; {

const path = `uploaded-files/${file.originalname}`;

const writablestream = createwritestream(path小白轻松搭建系统点我wcqh.cn);

file.stream.pipe(writablestream);

writablestream.on(finish, resolve);

writablestream.on(error, reject);

});

promises.push(promise);

});

await promise.all(promises);

// …

});

app.post(/cool-profile, async (req, res, next) =&gt; {

const parsedform = await parsegroups(req, req.headers);

// parsedform.groups i小白轻松搭建系统点我wcqh.cns an object (string -&gt; array) where fieldname is the key, and the value is array of files

//

// e.g.

//  parsedform.groups[avatar][0] -&gt; file

//  parsedform.groups -&gt; array

//

// parsedform.formfields will contain the text fields, if there were any

});

</void></void>

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import { multer } from @ts-stack/multer;

import express from express;

const parseformfields = new multer().none();

const app = express();

app.post(/profile, async (req, res, next) =&gt; {

const parsedform = await parseformfields(req, req.headers);

// parsedform.formfields cont小白轻松搭建系统点我wcqh.cnains the text fields

});

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const errormessages = new map<errormessagecode string>([

[client_aborted, client aborted],

[limit_file_size, file too large],

[limit_file_count, too many files],

[limit_field_key, field name too long],

[limit_field_value, field value too long],

[limit_fi小白轻松搭建系统点我wcqh.cneld_count, too many fields],

[limit_unexpected_file, unexpected file field],

]);

</errormessagecode>

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import { Multer, MulterError, ErrorMessageCode } from @ts-stack/multer;

// …

try {

const multer = new Multer().single(avatar);

const parsedForm = awa小白轻松搭建系统点我wcqh.cnit multer(req, req.headers);

// …

} catch (err) {

if (err instanceof MulterError) {

err.code // This property is of type ErrorMessageCode.

// …

}

}

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