This document describes in more details how to use this library along with OAuth.

Before reading this document, to better understand how authentication and OAuth work on the cozy-stack, you should read this document.

The library exposes internal methods to access the OAuth endpoints of the cozy-stack. See cozy.auth.* methods. However, the library also provides a more automated way to perform de OAuth flow by implementing many details of the OAuth registration and authorization flow for you.

Here we describe the automated and stateful method.


To handle the workflow automatically, the user of the library shoud pass a storage object that will be used to store the OAuth client and tokens informations.

This storage should implement the following “interface”:

interface Storage {
  load(key: string) : Promise<any>
  save(key: string, value: any) : Promise<any>
  delete(key: string) : Promise<boolean>
  clear() : Promise<>

The library provides two implementation of such storage: - cozy.auth.MemoryStorage storing data in-memory - cozy.auth.LocalStorage storage data in a html5 localStorage

The library constructor (on init method) should be passed the storage in the storage field of the oauth options.

Registration parameters

In order to handle the registration of the client, two callbacks should be provided to the cozy-client-js instance.

The onRegistered callback is called with the registered client and the URL on which the user should go to give access to the application.

Complete example for Node.JS

Here is a complete example running on Node.JS with a local http server receiving as redirect URI receiving the call of the user to complete the authorization of the client.

const http = require('http');
const {Cozy,MemoryStorage} = require('./dist/cozy-client.node.js')

function onRegistered(client, url) {
  let server
  return new Promise((resolve) => {
    server = http.createServer((request, response) => {
      if (request.url.indexOf('/do_access') === 0) {
        console.log('Received access from user with url', request.url)
    server.listen(3333, () => {
      console.log('Please visit the following url to authorize the application: ', url)
      (url) => { server.close(); return url; },
      (err) => { server.close(); throw err; }

const cozy = new Cozy({
  cozyURL: '',
  oauth: {
    storage: new MemoryStorage(),
    clientParams: {
      redirectURI: 'http://localhost:3333/do_access',
      softwareID: 'foobar',
      clientName: 'client',
      scopes: ['files/images:read']
    onRegistered: onRegistered,

cozy.authorize().then((creds) => console.log(creds))