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

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