Multer Storage Cloudinary

A multer storage engine for Cloudinary. Also consult the Cloudinary API.

Installation

npm install multer-storage-cloudinary

Usage

const cloudinary = require('cloudinary').v2;
const { CloudinaryStorage } = require('multer-storage-cloudinary');
const express = require('express');
const multer = require('multer');
 
const app = express();
 
const storage = new CloudinaryStorage({
  cloudinary: cloudinary,
  params: {
    folder: 'some-folder-name',
    format: async (req, file) => 'png', // supports promises as well
    public_id: (req, file) => 'computed-filename-using-request',
  },
});
 
const parser = multer({ storage: storage });
 
app.post('/upload', parser.single('image'), function (req, res) {
  res.json(req.file);
});

File properties

File objects will expose the following properties mapped from the Cloudinary API:

Key	Description
filename	public_id of the file on cloudinary
path	A URL for fetching the file
size	Size of the file in bytes

Options

Storage can be configured using the options argument passed to the CloudinaryStorage constructor.

const { CloudinaryStorage } = require('multer-storage-cloudinary');
 
const storage = new CloudinaryStorage({
  cloudinary: cloudinary,
  params: {
    // upload paramters
  },
});

All parameters are optional except the configured Cloudinary API object:

Parameter	Description	Type
options.cloudinary	A Cloudinary API object The API must be configured by the user	object required
options.params	An object or a function that resolves to an object which can contain any/all properties described in the Cloudinary upload API docs. Read below for more information	object or function

Each property in the params object (either directly or resolved from the function) can either be a static value or an async function that resolves to the required value. All upload parameters specified in the Cloudinary docs are supported.

Note: public_id is different in that it must always be a functional parameter

Functional parameters are called on every request and can be used in the following way:

const cloudinary = require('cloudinary').v2;
const { CloudinaryStorage } = require('multer-storage-cloudinary');
 
const storage = new CloudinaryStorage({
  cloudinary: cloudinary,
  params: {
    folder: (req, file) => 'folder_name',
    format: async (req, file) => {
      // async code using `req` and `file`
      // ...
      return 'jpeg';
    },
    public_id: (req, file) => 'some_unique_id',
  },
});

You can also provide all params using a single function

const cloudinary = require('cloudinary').v2;
const { CloudinaryStorage } = require('multer-storage-cloudinary');
 
const storage = new CloudinaryStorage({
  cloudinary: cloudinary,
  params: async (req, file) => {
    // async code using `req` and `file`
    // ...
    return {
      folder: 'folder_name',
      format: 'jpeg',
      public_id: 'some_unique_id',
    };
  },
});

Typescript

This library is written is typescript and so provides all types necessary for use in a typescript project.

Testing

The Cloudinary API must be configured using the CLOUDINARY_URL environment variable in order to run the tests. All test files are stored in a seperate Cloudinary folder, which is deleted after tests finish.

npm test