Upload Media to Your Cosmic JS Bucket using Multer

index.js

// index.js
const fs = require('fs')
const Cosmic = require('cosmicjs')()
const multer = require('multer')
const express = require('express')
var app = express()
const bucket = Cosmic.bucket({
  slug: 'your-bucket-slug',
  write_key: ''
})
var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, __dirname + '/uploads')
  },
  filename: function (req, file, cb) {
    cb(null, file.fieldname + '-' + Date.now())
  }
})
var upload = multer({ storage: storage })
app.post('/upload', upload.single('file'), async function(req, res) {
  try {
    const media_object = {
      originalname: req.file.originalname,
      buffer: fs.createReadStream(req.file.path)
    }
    const response = await bucket.addMedia({ media: media_object });
    return res.json(response);
  } catch (e) {
    console.log(e)
  }
});
app.listen(5000);