How to get direct URL to multipart file uploaded via Node.js

Question

I wish to post file to multipart form and upload it to Amazon S3 Bucket and return to user link to the file.

const express = require('express'),
    aws = require('aws-sdk'),
    bodyParser = require('body-parser'),
    multer = require('multer'),
    multerS3 = require('multer-s3');

aws.config.update({
    secretAccessKey: 'secret',
    accessKeyId: 'secret',
    region: 'us-east-2'
});

const app = express(),
    s3 = new aws.S3();

app.use(bodyParser.json());

const upload = multer({
    storage: multerS3({
        s3: s3,
        bucket: 'some-name',
        key: (req, file, cb) => {
            console.log(file);
            cb(null, file.originalname); //use Date.now() for unique file keys
        }
    })
});

app.post('/upload', upload.array('file',1), (req, res, next) => {
    res.send("How to return File URL?");
});

app.listen(3000);

How can I have the direct URL to the file?

Answer 1

( Multer NPM ) has already written there in documentation:

.single(fieldname) => (req.file)

Accept a single file with the name fieldname. The single file will be stored in req.file .

app.post('/upload', upload.single('file'), (req, res, next) => {
    console.log('Uploaded!');
    res.send(req.file);
});

.array(fieldname[, maxCount]) => (req.files)

Accept an array of files, all with the name fieldname. Optionally error out if more than maxCount files are uploaded. The array of files will be stored in req.files .

app.post('/upload', upload.array('file', 1), (req, res, next) => {
    console.log('Uploaded!');
    res.send(req.files);
});

.fields(fields) => (req.files)

Accept a mix of files, specified by fields. An object with arrays of files will be stored in req.files

app.post('/upload', upload.fields([
  { name: 'avatar', maxCount: 1 },
  { name: 'gallery', maxCount: 8 }
]), (req, res, next) => {
    console.log('Uploaded!');
    res.send(req.files);
});

.any() => (req.files)

Accepts all files that comes over the wire. An array of files will be stored in req.files .

.none()

Accept only text fields. If any file upload is made, error with code "LIMIT_UNEXPECTED_FILE" will be issued.

Answer 2

U could get it from the location property of the file.

res.send(req.file.location);

Answer 3

Just use

req.file.location

in the Success Response