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authentication authorization aws aws-lambda azure express gcp hapi javascript js koa lambda middleware node nodejs oauth oauth2 server serverless vercel

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# Grant



[![npm-version]][npm] [![test-ci-img]][test-ci-url] [![test-cov-img]][test-cov-url] [![snyk-vulnerabilities]][snyk]



> _OAuth Proxy_



## 200+ Supported Providers / [OAuth Playground][grant-oauth]



[`23andme`](https://api.23andme.com) | [`500px`](https://github.com/500px/api-documentation) | [`acton`](https://developer.act-on.com) | [`acuityscheduling`](https://developers.acuityscheduling.com) | [`adobe`](https://developer.adobe.com) | [`aha`](https://www.aha.io/api) | [`alchemer`](https://apihelp.alchemer.com) | [`amazon`](https://login.amazon.com/documentation) | [`angellist`](https://angel.co/api) | [`apple`](https://developer.apple.com) | [`arcgis`](https://developers.arcgis.com) | [`asana`](https://asana.com/developers) | [`assembla`](https://api-docs.assembla.cc) | [`atlassian`](https://developer.atlassian.com) | [`auth0`](https://auth0.com/docs) | [`authentik`](https://docs.goauthentik.io/docs) | [`authentiq`](https://www.authentiq.com/developers) | [`authing`](https://www.authing.cn/developer) | [`autodesk`](https://forge.autodesk.com) | [`aweber`](https://api.aweber.com) | [`axosoft`](https://developer.axosoft.com) | [`baidu`](https://developer.baidu.com) | [`basecamp`](https://github.com/basecamp/bc3-api) | [`battlenet`](https://develop.battle.net) | [`beatport`](https://oauth-api.beatport.com) | [`bitbucket`](https://developer.atlassian.com/bitbucket/api/2/reference/) | [`bitly`](https://dev.bitly.com) | [`box`](https://developer.box.com) | [`buffer`](https://buffer.com/developers) | [`campaignmonitor`](https://www.campaignmonitor.com/api) | [`cas`](https://apereo.github.io/cas/) | [`cheddar`](https://cheddarapp.com/developer) | [`clio`](https://app.clio.com/api/v4/documentation) | [`cognito`](https://aws.amazon.com/cognito/) | [`coinbase`](https://developers.coinbase.com) | [`concur`](https://developer.concur.com) | [`constantcontact`](https://developer.constantcontact.com) | [`coursera`](https://building.coursera.org) | [`crossid`](https://developer.crossid.io) | [`dailymotion`](https://developer.dailymotion.com) | [`deezer`](https://developers.deezer.com) | [`delivery`](https://developers.delivery.com) | [`deputy`](https://www.deputy.com/api-doc/) | [`deviantart`](https://www.deviantart.com/developers/) | [`digitalocean`](https://developers.digitalocean.com) | [`discogs`](https://www.discogs.com/developers/) | [`discord`](https://discord.com/developers/docs/intro) | [`disqus`](https://disqus.com/api/docs) | [`docusign`](https://developers.docusign.com) | [`dribbble`](https://developer.dribbble.com) | [`dropbox`](https://www.dropbox.com/developers) | [`ebay`](https://developer.ebay.com) | [`echosign`](https://secure.echosign.com/public/docs/restapi/v3) | [`ecwid`](https://developers.ecwid.com) | [`edmodo`](https://partnerships.edmodo.com) | [`egnyte`](https://developers.egnyte.com) | [`etsy`](https://www.etsy.com/developers) | [`eventbrite`](https://www.eventbrite.com/platform) | [`evernote`](https://dev.evernote.com) | [`eyeem`](https://github.com/eyeem/Public-API) | [`facebook`](https://developers.facebook.com) | [`familysearch`](https://www.familysearch.org/developers/) | [`feedly`](https://developer.feedly.com) | [`figma`](https://www.figma.com/developers) | [`fitbit`](https://dev.fitbit.com) | [`flickr`](https://www.flickr.com/services) | [`formstack`](https://developers.formstack.com) | [`foursquare`](https://developer.foursquare.com) | [`freeagent`](https://dev.freeagent.com) | [`freelancer`](https://developers.freelancer.com) | [`freshbooks`](https://www.freshbooks.com/developers) | [`fusionauth`](https://fusionauth.io/docs/) | [`garmin`](https://developer.garmin.com) | [`geeklist`](http://hackers.geekli.st) | [`genius`](https://docs.genius.com) | [`getbase`](https://developers.getbase.com) | [`getpocket`](https://getpocket.com/developer) | [`gitbook`](https://developer.gitbook.com) | [`github`](https://docs.github.com/developers) | [`gitlab`](https://docs.gitlab.com/ce/api/) | [`gitter`](https://developer.gitter.im) | [`goodreads`](https://www.goodreads.com/api) | [`google`](https://developers.google.com) | [`groove`](https://www.groovehq.com/docs) | [`gumroad`](https://gumroad.com/api) | [`harvest`](https://help.getharvest.com/api-v2/) | [`hellosign`](https://www.hellosign.com/api) | [`heroku`](https://devcenter.heroku.com/categories/platform-api) | [`homeaway`](https://www.homeaway.com/platform) | [`hootsuite`](https://developer.hootsuite.com) | [`huddle`](https://www.huddle.com/huddle-api/) | [`ibm`](https://ibm.biz/provisioner) | [`iconfinder`](https://developer.iconfinder.com) | [`idme`](https://developers.id.me) | [`idonethis`](https://i-done-this.readme.io/docs) | [`imgur`](https://apidocs.imgur.com) | [`infusionsoft`](https://developer.infusionsoft.com) | [`instagram`](https://instagram.com/developer) | [`intuit`](https://developer.intuit.com) | [`jamendo`](https://devportal.jamendo.com/) | [`jumplead`](https://developer.jumplead.com) | [`kakao`](https://developers.kakao.com) | [`keycloak`](https://www.keycloak.org) | [`line`](https://developers.line.biz) | [`linkedin`](https://www.linkedin.com/developers) | [`live`](https://docs.microsoft.com/en-us/onedrive/developer/rest-api/getting-started/msa-oauth?view=odsp-graph-online) | [`livechat`](https://developers.livechatinc.com) | [`logingov`](https://developers.login.gov) | [`lyft`](https://developer.lyft.com) | [`mailchimp`](https://developer.mailchimp.com) | [`mailup`](http://help.mailup.com/display/mailupapi/REST+API) | [`mailxpert`](https://dev.mailxpert.ch) | [`mapmyfitness`](https://developer.underarmour.com) | [`mastodon`](https://docs.joinmastodon.org/) | [`medium`](https://developers.medium.com) | [`meetup`](https://www.meetup.com/meetup_api/) | [`mendeley`](https://dev.mendeley.com) | [`mention`](https://dev.mention.com) | [`microsoft`](https://developer.microsoft.com/en-us/graph) | [`mixcloud`](https://www.mixcloud.com/developers) | [`moxtra`](https://developer.moxtra.com) | [`myob`](https://developer.myob.com) | [`naver`](https://developers.naver.com) | [`nest`](https://developers.nest.com) | [`netlify`](https://docs.netlify.com) | [`nokotime`](https://developer.nokotime.com) | [`notion`](https://developers.notion.com) | [`nylas`](https://docs.nylas.com) | [`okta`](https://developer.okta.com/) | [`onelogin`](https://developers.onelogin.com) | [`openstreetmap`](https://wiki.openstreetmap.org/wiki/API_v0.6) | [`optimizely`](https://developers.optimizely.com) | [`osu`](https://osu.ppy.sh/docs) | [`patreon`](https://docs.patreon.com) | [`paypal`](https://developer.paypal.com) | [`phantauth`](https://www.phantauth.net) | [`pinterest`](https://developers.pinterest.com) | [`plurk`](https://www.plurk.com/API) | [`podio`](https://developers.podio.com) | [`procore`](https://developers.procore.com) | [`producthunt`](https://api.producthunt.com/v2/docs) | [`projectplace`](https://service.projectplace.com/apidocs) | [`pushbullet`](https://docs.pushbullet.com) | [`qq`](https://wiki.connect.qq.com/准备工作_oauth2-0) | [`ravelry`](https://www.ravelry.com/api) | [`redbooth`](https://redbooth.com/api) | [`reddit`](https://www.reddit.com/dev/api) | [`runkeeper`](https://runkeeper.com/developer/healthgraph/) | [`salesforce`](https://developer.salesforce.com) | [`sellsy`](https://api.sellsy.com) | [`shoeboxed`](https://github.com/Shoeboxed/api) | [`shopify`](https://developers.shopify.com) | [`skyrock`](https://www.skyrock.com/developer) | [`slack`](https://api.slack.com) | [`slice`](https://developer.slice.com) | [`smartsheet`](https://smartsheet-platform.github.io/api-docs) | [`smugmug`](https://api.smugmug.com) | [`snapchat`](https://kit.snapchat.com) | [`snowflake`](https://docs.snowflake.com) | [`socialpilot`](https://developer.socialpilot.co) | [`socrata`](https://dev.socrata.com) | [`soundcloud`](https://developers.soundcloud.com) | [`spotify`](https://developer.spotify.com) | [`square`](https://squareup.com/developers) | [`stackexchange`](https://api.stackexchange.com) | [`stocktwits`](https://api.stocktwits.com/developers) | [`stormz`](https://developer.stormz.me) | [`storyblok`](https://www.storyblok.com/docs/guide/introduction) | [`strava`](https://developers.strava.com) | [`stripe`](https://stripe.com/docs) | [`surveymonkey`](https://developer.surveymonkey.com) | [`surveysparrow`](https://surveysparrow.com/developer) | [`thingiverse`](https://www.thingiverse.com/developers) | [`ticketbud`](https://api.ticketbud.com) | [`tiktok`](https://developers.tiktok.com/) | [`timelyapp`](https://dev.timelyapp.com) | [`todoist`](https://developer.todoist.com) | [`trakt`](https://trakt.docs.apiary.io) | [`traxo`](https://developer.traxo.com) | [`trello`](https://developers.trello.com) | [`tripit`](https://www.tripit.com/developer) | [`trustpilot`](https://developers.trustpilot.com) | [`tumblr`](https://www.tumblr.com/docs/en/api/v2) | [`twitch`](https://dev.twitch.tv) | [`twitter`](https://developer.twitter.com) | [`typeform`](https://developer.typeform.com) | [`uber`](https://developer.uber.com) | [`unbounce`](https://developer.unbounce.com) | [`underarmour`](https://developer.underarmour.com) | [`unsplash`](https://unsplash.com/documentation) | [`untappd`](https://untappd.com/api/docs) | [`upwork`](https://developers.upwork.com) | [`uservoice`](https://developer.uservoice.com) | [`vend`](https://developers.vendhq.com) | [`venmo`](https://developers.braintreepayments.com/guides/venmo/overview/) | [`vercel`](https://vercel.com/docs) | [`verticalresponse`](http://developers.verticalresponse.com) | [`viadeo`](https://partners.viadeo.com) | [`vimeo`](https://developer.vimeo.com) | [`visualstudio`](https://docs.microsoft.com/en-us/vsts/integrate/get-started/authentication/oauth?view=vsts) | [`vk`](https://vk.com/dev) | [`wechat`](https://mp.weixin.qq.com) | [`weekdone`](https://weekdone.com/developer) | [`weibo`](https://open.weibo.com) | [`withings`](https://developer.withings.com) | [`wordpress`](https://developer.wordpress.com) | [`workos`](https://workos.com/docs/sso) | [`wrike`](https://developers.wrike.com) | [`xero`](https://developer.xero.com) | [`xing`](https://dev.xing.com) | [`yahoo`](https://developer.yahoo.com) | [`yammer`](https://developer.yammer.com/docs) | [`yandex`](https://tech.yandex.com) | [`zendesk`](https://developer.zendesk.com) | [`zoom`](https://marketplace.zoom.us/docs)



## Table of Contents



### [Migration Guide: from v4 to v5][migration]



- **[Providers](#grant)**

- **Handlers**

  - [Express](#handlers) / [Koa](#handlers) / [Hapi](#handlers) / [Fastify](#handlers)

  - [AWS Lambda](#handlers) / [Azure Function](#handlers) / [Google Cloud Function](#handlers) / [Vercel](#handlers)

- **Configuration**

  - [Basics](#configuration-basics) / [Description](#configuration-description) / [Values](#configuration-values) / [Scopes](#configuration-scopes)

- **Connect**

  - [Origin](#connect-origin) / [Prefix](#connect-prefix) / [Redirect URI](#connect-redirect-uri) / [Custom Parameters](#connect-custom-parameters) / [OpenID Connect](#connect-openid-connect) / [PKCE](#connect-pkce) / [Static Overrides](#connect-static-overrides)

- **Callback**

  - [Data](#callback-data) / [Transport](#callback-transport) / [Response](#callback-response) / [Session](#callback-session)

- **Dynamic Configuration**

  - [Instance](#dynamic-instance) / [State](#dynamic-state) / [HTTP](#dynamic-http) / [OAuth Proxy](#dynamic-oauth-proxy)

- **Misc**

  - [Configuration](#misc-redirect-uri) / [Handlers](#misc-handler-constructors) / [Request](#misc-request) / [Types](#misc-es-modules-and-typescript) / [OAuth Quirks](#misc-oauth-quirks)

- **Examples**

  - [express][examples] / [koa][examples] / [hapi][examples] / [fastify][examples] / [aws][grant-aws] / [azure][grant-azure] / [gcloud][grant-gcloud] / [vercel][grant-vercel]

- **[Changelog][changelog]**



----



# Handlers



### HTTP Frameworks



Express



```js

var express = require('express')

var session = require('express-session')

var grant = require('grant').express()



var app = express()

// REQUIRED: any session store - see /examples/handler-express

app.use(session({secret: 'grant'}))

// mount grant

app.use(grant({/*configuration - see below*/}))

```



Koa



```js

var Koa = require('koa')

var session = require('koa-session')

var grant = require('grant').koa()



var app = new Koa()

// REQUIRED: any session store - see /examples/handler-koa

app.keys = ['grant']

app.use(session(app))

// mount grant

app.use(grant({/*configuration - see below*/}))

```



Hapi



```js

var Hapi = require('hapi')

var yar = require('yar')

var grant = require('grant').hapi()



var server = new Hapi.Server()

server.register([

  // REQUIRED: any session store - see /examples/handler-hapi

  {plugin: yar, options: {cookieOptions: {password: 'grant', isSecure: false}}},

  // mount grant

  {plugin: grant({/*configuration - see below*/})}

])

```



Fastify



```js

var fastify = require('fastify')

var cookie = require('@fastify/cookie')

var session = require('@fastify/session')

var grant = require('grant').fastify()



fastify()

  .register(cookie)

  .register(session, {secret: 'grant', cookie: {secure: false}})

  .register(grant({/*configuration - see below*/}))

```



### Serverless Functions



AWS Lambda



```js

var grant = require('grant').aws({

  config: {/*configuration - see below*/}, session: {secret: 'grant'}

})



exports.handler = async (event) => {

  var {redirect, response} = await grant(event)

  return redirect || {

    statusCode: 200,

    headers: {'content-type': 'application/json'},

    body: JSON.stringify(response)

  }

}

```



Azure Function



```js

var grant = require('grant').azure({

  config: {/*configuration - see below*/}, session: {secret: 'grant'}

})



module.exports = async (context, req) => {

  var {redirect, response} = await grant(req)

  return redirect || {

    status: 200,

    headers: {'content-type': 'application/json'},

    body: JSON.stringify(response)

  }

}

```



Google Cloud Function



```js

var grant = require('grant').gcloud({

  config: {/*configuration - see below*/}, session: {secret: 'grant'}

})



exports.handler = async (req, res) => {

  var {response} = await grant(req, res)

  if (response) {

    res.statusCode = 200

    res.setHeader('content-type', 'application/json')

    res.end(JSON.stringify(response))

  }

}

```



Vercel



```js

var grant = require('grant').vercel({

  config: {/*configuration - see below*/}, session: {secret: 'grant'}

})



module.exports = async (req, res) => {

  var {response} = await grant(req, res)

  if (response) {

    res.statusCode = 200

    res.setHeader('content-type', 'application/json')

    res.end(JSON.stringify(response))

  }

}

```



### Examples



> __[express][examples] / [koa][examples] / [hapi][examples] / [fastify][examples] / [aws][grant-aws] / [azure][grant-azure] / [gcloud][grant-gcloud] / [vercel][grant-vercel]__



> _[ES Modules and TypeScript](#misc-es-modules-and-typescript)_



---



# Configuration



## Configuration: Basics



```json

{

  "defaults": {

    "origin": "http://localhost:3000",

    "transport": "session",

    "state": true

  },

  "google": {

    "key": "...",

    "secret": "...",

    "scope": ["openid"],

    "nonce": true,

    "custom_params": {"access_type": "offline"},

    "callback": "/hello"

  },

  "twitter": {

    "key": "...",

    "secret": "...",

    "callback": "/hi"

  }

}

```



- **defaults** - default configuration for all providers

  - **origin** - where your client server can be reached `http://localhost:3000` | `https://site.com` ...

  - **transport** - a [transport](#callback-transport) used to deliver the [response data](#callback-response) in your `callback` route

  - **state** - generate random state string

- **provider** - any [supported provider](#grant) `google` | `twitter` ...

  - **key** - `consumer_key` or `client_id` of your OAuth app

  - **secret** - `consumer_secret` or `client_secret` of your OAuth app

  - **scope** - array of OAuth scopes to request

  - **nonce** - generate random nonce string ([OpenID Connect](#connect-openid-connect) only)

  - **custom_params** - custom [authorization parameters](#connect-custom-parameters)

  - **callback** - relative route or absolute URL to receive the response data `/hello` | `https://site.com/hey` ...



## Configuration: Description



Key | Location | Description

:-| :-: | :-

***Authorization Server*** |

**`request_url`** | [oauth.json] | OAuth 1.0a only, first step

**`authorize_url`** | [oauth.json] | OAuth 2.0 first step, OAuth 1.0a second step

**`access_url`** | [oauth.json] | OAuth 2.0 second step, OAuth 1.0a third step

**`oauth`** | [oauth.json] | OAuth version number

**`scope_delimiter`** | [oauth.json] | String delimiter used for concatenating multiple scopes

**`token_endpoint_auth_method`** | `[provider]` | Authentication method for the token endpoint

**`token_endpoint_auth_signing_alg`** | `[provider]` | Signing algorithm for the token endpoint

***Client Server*** |

**`origin`** | `defaults` | Where your client server can be reached

**`prefix`** | `defaults` | Path prefix for the Grant internal routes

**`state`** | `defaults` | Random state string for OAuth 2.0

**`nonce`** | `defaults` | Random nonce string for OpenID Connect

**`pkce`** | `defaults` | Toggle PKCE support

**`response`** | `defaults` | Response data to receive

**`transport`** | `defaults` | A way to deliver the response data

**`callback`** | `[provider]` | Relative or absolute URL to receive the response data

**`overrides`** | `[provider]` | Static configuration overrides for a provider

**`dynamic`** | `[provider]` | Configuration keys that can be overridden dynamically over HTTP

***Client App*** |

**`key`** **`client_id`** **`consumer_key`** | `[provider]` | The `client_id` or `consumer_key` of your OAuth app

**`secret`** **`client_secret`**  **`consumer_secret`** | `[provider]` | The `client_secret` or `consumer_secret` of your OAuth app

**`scope`** | `[provider]` | List of scopes to request

**`custom_params`** | `[provider]` | Custom authorization parameters and their values

**`subdomain`** | `[provider]` | String to embed into the authorization server URLs

**`public_key`** | `[provider]` | Public PEM or JWK

**`private_key`** | `[provider]` | Private PEM or JWK

**`redirect_uri`** | `generated` | Absolute redirect URL of the OAuth app

***Grant*** |

**`name`** | `generated` | Provider's [name](#grant)

**`[provider]`** | `generated` | Provider's [name](#grant) as key

**`profile_url`** | [profile.json] | User profile URL



## Configuration: Values



Key | Location | Value

:- | :-: | :-:

***Authorization Server*** |

**`request_url`** | [oauth.json] | `'https://api.twitter.com/oauth/request_token'`

**`authorize_url`** | [oauth.json] | `'https://api.twitter.com/oauth/authenticate'`

**`access_url`** | [oauth.json] | `'https://api.twitter.com/oauth/access_token'`

**`oauth`** | [oauth.json] | `2` `1`

**`scope_delimiter`** | [oauth.json] | `','` `' '`

**`token_endpoint_auth_method`** | `[provider]` | `'client_secret_post'` `'client_secret_basic'` `'private_key_jwt'`

**`token_endpoint_auth_signing_alg`** | `[provider]` | `'RS256'` `'ES256'` `'PS256'`

***Client Server*** |

**`origin`** | `defaults` | `'http://localhost:3000'` `https://site.com`

**`prefix`** | `defaults` | `'/connect'` `/oauth` `''`

**`state`** | `defaults` | `true`

**`nonce`** | `defaults` | `true`

**`pkce`** | `defaults` | `true`

**`response`** | `defaults` | `['tokens', 'raw', 'jwt', 'profile']`

**`transport`** | `defaults` | `'querystring'` `'session'` `'state'`

**`callback`** | `[provider]` | `'/hello'` `'https://site.com/hi'`

**`overrides`** | `[provider]` | `{something: {scope: ['..']}}`

**`dynamic`** | `[provider]` | `['scope', 'subdomain']`

***Client App*** |

**`key`** **`client_id`** **`consumer_key`** | `[provider]` | `'123'`

**`secret`** **`client_secret`**  **`consumer_secret`** | `[provider]` | `'123'`

**`scope`** | `[provider]` | `['openid', '..']`

**`custom_params`** | `[provider]` | `{access_type: 'offline'}`

**`subdomain`** | `[provider]` | `'myorg'`

**`public_key`** | `[provider]` | `'..PEM..'` `'{..JWK..}'`

**`private_key`** | `[provider]` | `'..PEM..'` `'{..JWK..}'`

**`redirect_uri`** |`generated` | `'http://localhost:3000/connect/twitter/callback'`

***Grant*** |

**`name`** |`generated` | `name: 'twitter'`

**`[provider]`** |`generated` | `twitter: true`

**`profile_url`** | [profile.json] | `'https://api.twitter.com/1.1/users/show.json'`



## Configuration: Scopes



Grant relies on configuration gathered from **6** different places:



1. The **first** place Grant looks for configuration is the built-in [oauth.json] file located in the config folder.



2. The **second** place Grant looks for configuration is the `defaults` key, specified in the user's configuration. These defaults are applied for every provider in the user's configuration.



3. The **third** place for configuration is the provider itself. All providers in the user's configuration inherit every option defined for them in the [oauth.json] file, and all options defined inside the `defaults` key. Having [oauth.json] file and a `defaults` configuration is only a convenience. You can define all available options directly for a provider.



4. The **fourth** place for configuration are the provider's [`overrides`](#connect-static-overrides). The static overrides inherit their parent provider, essentially creating new provider of the same type.



5. The **fifth** place for configuration is the dynamic [state](#dynamic-state) override. The request/response lifecycle state of your HTTP framework of choice can be used to dynamically override configuration.



6. The **sixth** place for configuration, that _[potentially](#dynamic-oauth-proxy)_ can override all of the above, and make all of the above optional, is the [`dynamic`](#dynamic-http) HTTP override.



---



# Connect



## Connect: Origin



The `origin` is where your client server can be reached:



```json

{

  "defaults": {

    "origin": "http://localhost:3000"

  }

}

```



You login by navigating to the `/connect/:provider` route where `:provider` is a key in your configuration, usually one of the [officially supported](#grant) ones, but you can define [your own](#misc-custom-providers) as well. Additionally you can login through a [static override](#connect-static-overrides) defined for that provider by navigating to the `/connect/:provider/:override?` route.



## Connect: Prefix



By default Grant operates on the following two routes:



```

/connect/:provider/:override?

/connect/:provider/callback

```



However, the default `/connect` prefix can be configured:



```json

{

  "defaults": {

    "origin": "http://localhost:3000",

    "prefix": "/oauth"

  }

}

```



## Connect: Redirect URI



The [`redirect_uri`](#misc-redirect-uri) of your OAuth app should follow this format:



```

[origin][prefix]/[provider]/callback

```



Where [`origin`](#connect-origin) and [`prefix`](#connect-prefix) have to match the ones set in your configuration, and [`provider`](#grant) is a provider key found in your configuration.



For example: `http://localhost:3000/connect/google/callback`



This redirect URI is used internally by Grant. Depending on the [`transport`](#callback-transport) being used you will receive the response data in the [`callback`](#callback-data) route or absolute URL configured for that provider.



## Connect: Custom Parameters



Some providers may employ custom authorization parameters that you can configure using the `custom_params` key:



```json

{

  "google": {

    "custom_params": {"access_type": "offline", "prompt": "consent"}

  },

  "reddit": {

    "custom_params": {"duration": "permanent"}

  },

  "trello": {

    "custom_params": {"name": "my app", "expiration": "never"}

  }

}

```



## Connect: OpenID Connect



The `openid` scope is required, and generating a random `nonce` string is optional but recommended:



```json

{

  "google": {

    "scope": ["openid"],

    "nonce": true

  }

}

```



Grant **does not** verify the signature of the returned `id_token` by default.



However, the following two claims of the `id_token` are being validated:



1. `aud` - is the token intended for my OAuth app?

2. `nonce` - does it tie to a request of my own?



## Connect: PKCE



PKCE can be enabled for all providers or for a specific provider only:



```json

{

  "google": {

    "pkce": true

  }

}

```



Providers that do not support PKCE will ignore the additional parameters being sent.



## Connect: Static Overrides



Provider sub configurations can be configured using the `overrides` key:



```json

{

  "github": {

    "key": "...", "secret": "...",

    "scope": ["public_repo"],

    "callback": "/hello",

    "overrides": {

      "notifications": {

        "key": "...", "secret": "...",

        "scope": ["notifications"]

      },

      "all": {

        "scope": ["repo", "gist", "user"],

        "callback": "/hey"

      }

    }

  }

}

```



Navigate to:



- `/connect/github` to request the public_repo `scope`

- `/connect/github/notifications` to request the notifications `scope` using another OAuth App (`key` and `secret`)

- `/connect/github/all` to request a bunch of `scope`s and also receive the response data in another `callback` route



---



# Callback



## Callback: Data



By default the response data will be returned in your `callback` route or absolute URL encoded as querystring.



Depending on the [`transport`](#callback-transport) being used the response data can be returned in the `session` or in the `state` object instead.



The amount of the returned data can be controlled by using the [`response`](#callback-response) configuration.



### OAuth 2.0



```js

{

  id_token: '...',

  access_token: '...',

  refresh_token: '...',

  raw: {

    id_token: '...',

    access_token: '...',

    refresh_token: '...',

    some: 'other data'

  }

}

```



The `refresh_token` is optional. The `id_token` is returned only for [OpenID Connect](#connect-openid-connect) providers requesting the `openid` scope.



### OAuth 1.0a



```js

{

  access_token: '...',

  access_secret: '...',

  raw: {

    oauth_token: '...',

    oauth_token_secret: '...',

    some: 'other data'

  }

}

```



### Error



```js

{

  error: {

    some: 'error data'

  }

}

```



## Callback: Transport



### querystring



By default Grant will encode the OAuth [response data](#callback-data) as `querystring` in your `callback` route or absolute URL:



```json

{

  "github": {

    "callback": "https://site.com/hello"

  }

}

```



This is useful when using Grant as [OAuth Proxy](#dynamic-oauth-proxy). However this final `https://site.com/hello?access_token=...` redirect potentially may leak private data in your server logs, especially when sitting behind a reverse proxy.



### session



For local `callback` routes the session `transport` is recommended:



```json

{

  "defaults": {

    "transport": "session"

  },

  "github": {

    "callback": "/hello"

  }

}

```



This will make the OAuth [response data](#callback-data) available in the `session` object instead:



```js

req.session.grant.response // Express

ctx.session.grant.response // Koa

req.yar.get('grant').response // Hapi

req.session.grant.response // Fastify

(await session.get()).grant.response // Serverless Function

```



### state



The request/response lifecycle `state` can be used as well:



```json

{

  "defaults": {

    "transport": "state"

  }

}

```



In this case a `callback` route is not needed, and it will be ignored if provided. The response data will be available in the request/response lifecycle state object instead:



```js

res.locals.grant.response // Express

ctx.state.grant.response // Koa

req.plugins.grant.response // Hapi

res.grant.response // Fastify

var {response} = await grant(...) // Serverless Function

```



## Callback: Response



By default Grant returns all of the available tokens and the `raw` response data returned by the Authorization server:



```js

{

  id_token: '...',

  access_token: '...',

  refresh_token: '...',

  raw: {

    id_token: '...',

    access_token: '...',

    refresh_token: '...',

    some: 'other data'

  }

}

```



### querystring



When using the querystring [`transport`](#callback-transport) it might be a good idea to limit the response data:



```json

{

  "defaults": {

    "response": ["tokens"]

  }

}

```



This will return only the tokens available, without the `raw` response data.



This is useful when using Grant as [OAuth Proxy](#dynamic-oauth-proxy). Encoding potentially large amounts of data as querystring can lead to incompatibility issues with some servers and browsers, and generally is considered a bad practice.



### session



Using the session [`transport`](#callback-transport) is generally safer, but it also depends on the implementation of your session store.



In case your session store encodes the entire session in a cookie, not just the session ID, some servers may reject the HTTP request because of HTTP headers size being too big.



```json

{

  "google": {

    "response": ["tokens"]

  }

}

```



This will return only the tokens available, without the `raw` response data.



### jwt



Grant can also return even larger [response data](#callback-data) by including the decoded JWT for [OpenID Connect](#connect-openid-connect) providers that return `id_token`:



```json

{

  "google": {

    "response": ["tokens", "raw", "jwt"]

  }

}

```



This will make the decoded JWT available in the response data:



```js

{

  id_token: '...',

  access_token: '...',

  refresh_token: '...',

  raw: {

    id_token: '...',

    access_token: '...',

    refresh_token: '...',

    some: 'other data'

  },

  jwt: {id_token: {header: {}, payload: {}, signature: '...'}}

}

```



Make sure you include all of the response keys that you want to be returned when configuring the `response` data explicitly.



### profile



Outside of the regular OAuth flow, Grant can also request the user profile:



```json

{

  "google": {

    "response": ["tokens", "profile"]

  }

}

```



Additionaly a `profile` key will be available in the response data:



```js

{

  access_token: '...',

  refresh_token: '...',

  profile: {some: 'user data'}

}

```



The `profile` key contains either the raw response data returned by the user profile endpoint or an error message.



Not all of the supported providers have their `profile_url` set, and some of them might require custom parameters. Usually the user profile endpoint is accessible only when certain `scope`s were requested.



## Callback: Session



Grant uses session to persist state between HTTP redirects occurring during the OAuth flow. This session, however, was never meant to be used as persistent storage, even if that's totally possible.



Once you receive the [response data](#callback-data) in your `callback` route you are free to destroy that session.



However, there are a few session keys returned in your `callback` route, that you may find useful:



Key        | Availability            | Description

:--        | :--                     | :--

`provider` | **Always**              | The provider [name](#grant) used for this authorization

`override` | Depends on URL          | The [static override](#connect-static-overrides) name used for this authorization

`dynamic`  | Depends on request type | The [dynamic override](#dynamic-http) configuration passed to this authorization

`state`    | OAuth 2.0 only          | OAuth 2.0 state string that was generated

`nonce`    | OpenID Connect only     | [OpenID Connect](#connect-openid-connect) nonce string that was generated

`code_verifier` | PKCE only     | The code verifier that was generated for [PKCE](#connect-pkce)

`request`  | OAuth 1.0a only         | Data returned from the first request of the OAuth 1.0a flow

`response` | Depends on transport used | The final [response data](#callback-data)



---



# Dynamic Configuration



## Dynamic: Instance



Every Grant instance have a `config` property attached to it:



```js

var grant = Grant(require('./config'))

console.log(grant.config)

```



You can use the `config` property to alter the Grant's behavior during runtime without having to restart your server.



This property contains the **generated** configuration used internally by Grant, and changes made to that configuration affects the **entire** Grant instance!



## Dynamic: State



The request/response lifecycle state can be used to alter configuration on every request:



```js

var state = {dynamic: {subdomain: 'usershop'}}

res.locals.grant = state // Express

ctx.state.grant = state // Koa

req.plugins.grant = state // Hapi

req.grant = state // Fastify

await grant(..., state) // Serverless Function

```



This is useful in cases when you want to configure Grant dynamically with potentially sensitive data that you don't want to send over HTTP.



The request/response lifecycle state is not controlled by the [`dynamic`](#dynamic-http) configuration, meaning that you can override any configuration key.



Any allowed [`dynamic`](#dynamic-http) configuration key sent through HTTP GET/POST request will override the identical one set using a state override.



## Dynamic: HTTP



The `dynamic` configuration allows certain configuration keys to be set dynamically over HTTP GET/POST request.



For example `shopify` requires your shop name to be embedded into the OAuth URLs, so it makes sense to allow the [`subdomain`](#subdomain-urls) configuration key to be set dynamically:



```json

{

  "shopify": {

    "dynamic": ["subdomain"]

  }

}

```



Then you can have a web form on your website allowing the user to specify the shop name:



```html



  

  Login



```



Making a `POST` request to the `/connect/:provider/:override?` route requires a form body parser middleware:



```js

.use(require('body-parser').urlencoded({extended: true})) // Express

.use(require('koa-bodyparser')()) // Koa

.register(require('@fastify/formbody')) // Fastify

```



Alternatively you can make a `GET` request to the `/connect/:provider/:override?` route:



```

https://awesome.com/connect/shopify?subdomain=usershop

```



Any `dynamic` configuration sent over HTTP GET/POST request overrides any other configuration.



## Dynamic: OAuth Proxy



In case you really want to, you can allow `dynamic` configuration override of every configuration key for a provider:



```json

{

  "github": {

    "dynamic": true

  }

}

```



And the most extreme case is allowing even non preconfigured providers to be used dynamically:



```json

{

  "defaults": {

    "dynamic": true

  }

}

```



Essentially Grant is a completely transparent **[OAuth Proxy][oauth-like-a-boss]**.



---



# Misc



## Misc: Redirect URI



The [`origin`](#connect-origin) and the [`prefix`](#connect-prefix) configuration is used to generate the correct [`redirect_uri`](#connect-redirect-uri) that Grant expects:



```json

{

  "defaults": {

    "origin": "https://mysite.com"

  },

  "google": {},

  "twitter": {}

}

```



The above configuration is identical to:



```json

{

  "google": {

    "redirect_uri": "https://mysite.com/connect/google/callback"

  },

  "twitter": {

    "redirect_uri": "https://mysite.com/connect/twitter/callback"

  }

}

```



Explicitly specifying the `redirect_uri` overrides the one generated by default.



## Misc: Custom Providers



You can define your own provider by adding a key for it in your configuration. In this case all of the required configuration keys have to be specified:



```json

{

  "defaults": {

    "origin": "http://localhost:3000"

  },

  "awesome": {

    "authorize_url": "https://awesome.com/authorize",

    "access_url": "https://awesome.com/token",

    "oauth": 2,

    "key": "...",

    "secret": "...",

    "scope": ["read", "write"]

  }

}

```



Take a look at the [oauth.json] file on how various providers are being configured.



## Misc: Meta Configuration



You can document your configuration by adding custom keys to it:



```json

{

  "google": {

    "meta": {

      "app": "My Awesome OAuth App",

      "owner": "[email protected]",

      "url": "https://url/to/manage/oauth/app"

    }

  }

}

```



Note that `meta` is arbitrary key, but it cannot be one of the [reserved keys][reserved-keys].



## Misc: Handler Constructors



Grant supports different ways of instantiation:



```js

// Express or any other handler

var grant = require('grant').express()(config)

var grant = require('grant').express()({config, ...})

var grant = require('grant').express(config)

var grant = require('grant').express({config, ...})

var grant = require('grant')({handler: 'express', config, ...})

```



Using the `new` keyword is optional:



```js

var Grant = require('grant').express()

var grant = Grant(config)

var grant = new Grant(config)

```



Additionally Hapi accepts the configuration in two different ways:



```js

server.register([{plugin: grant(config)}])

server.register([{plugin: grant(), options: config}])

```



## Misc: Path Prefix



You can mount Grant under specific path prefix:



```js

// Express

app.use('/oauth', grant(config))

// Koa - using koa-mount

app.use(mount('/oauth', grant(config)))

// Hapi

server.register([{routes: {prefix: '/oauth'}, plugin: grant(config)}])

// Fastify

server.register(grant(config), {prefix: '/oauth'})

```



In this case the [`prefix`](#connect-prefix) configuration should reflect that + any other path parts that you may have:



```json

{

  "defaults": {

    "origin": "http://localhost:3000",

    "prefix": "/oauth/login"

  }

}

```



In this case you login by navigating to: `http://localhost:3000/oauth/login/:provider`



And the [`redirect_uri`](#connect-redirect-uri) of your OAuth app should be `http://localhost:3000/oauth/login/:provider/callback`



Optionally you can prefix your [`callback`](#callback) routes as well:



```json

{

  "github": {

    "callback": "/oauth/login/hello"

  }

}

```



## Misc: Request



The underlying [HTTP client] can be configured using the `request` option:



```js

var grant = require('grant').express({

  config,

  request: {agent, timeout: 5000}

})

```



Fancy [request logs] are available too:



```bash

npm i --save-dev request-logs

DEBUG=req,res,json node app.js

```



## Misc: ES Modules and TypeScript



Import Grant in your `.mjs` files:



```js

import express from 'express'

import session from 'express-session'

import grant from 'grant'

import config from './config.json'



express()

  .use(session({}))

  .use(grant.express(config))

```



Importing a `.json` file may require additional flag:



```bash

node --experimental-json-modules app.mjs

```



Grant ships with extensive [type definitions][type-definitions] for TypeScript. Additonal type definitions and examples can be found [here][grant-types].



## Misc: OAuth Quirks



### Subdomain URLs



Some providers have dynamic URLs containing bits of user information embedded into them. Inside the main [oauth.json] configuration file such URLs contain a `[subdomain]` token embedded in them.



The `subdomain` option can be used to specify your company name, server region etc:



```json

"shopify": {

  "subdomain": "mycompany"

},

"battlenet": {

  "subdomain": "us"

}

```



Then Grant will generate the correct OAuth URLs:



```json

"shopify": {

  "authorize_url": "https://mycompany.myshopify.com/admin/oauth/authorize",

  "access_url": "https://mycompany.myshopify.com/admin/oauth/access_token"

},

"battlenet": {

  "authorize_url": "https://us.battle.net/oauth/authorize",

  "access_url": "https://us.battle.net/oauth/token"

}

```



Alternatively you can override the entire `authorize_url` and `access_url` in your configuration.



### Sandbox OAuth URLs



Some providers may have Sandbox URLs to use while developing your app. To use them just override the entire `request_url`, `authorize_url` and `access_url` in your configuration (notice the `sandbox` bits):



```json

"paypal": {

  "authorize_url": "https://www.sandbox.paypal.com/webapps/auth/protocol/openidconnect/v1/authorize",

  "access_url": "https://api.sandbox.paypal.com/v1/identity/openidconnect/tokenservice"

},

"evernote": {

  "request_url": "https://sandbox.evernote.com/oauth",

  "authorize_url": "https://sandbox.evernote.com/OAuth.action",

  "access_url": "https://sandbox.evernote.com/oauth"

}

```



### Sandbox Redirect URI



Very rarely you may need to override the [`redirect_uri`](#connect-redirect-uri) that Grant generates for you.



For example Feedly supports only `http://localhost` as redirect URI of their Sandbox OAuth app, and it won't allow the correct `http://localhost/connect/feedly/callback` URL:



```json

"feedly": {

  "redirect_uri": "http://localhost"

}

```



In this case you'll have to redirect the user to the `[origin][prefix]/[provider]/callback` route that Grant uses to execute the last step of the OAuth flow:



```js

var qs = require('querystring')



app.get('/', (req, res) => {

  if (process.env.NODE_ENV === 'development' &&

      req.session.grant &&

      req.session.grant.provider === 'feedly' &&

      req.query.code

  ) {

    res.redirect(`/connect/${req.session.grant.provider}/callback?${qs.stringify(req.query)}`)

  }

})

```



As usual you will receive the response data in your final [`callback`](#callback) route.



### Provider Quirks



> **Ebay**



Set the Redirect URI of your OAuth app as usual `[origin][prefix]/[provider]/callback`. Then Ebay will generate a special string called RuName (eBay Redirect URL name) that you need to set as `redirect_uri` in Grant:



```json

"ebay": {

  "redirect_uri": "RUNAME"

}

```



> **Flickr, Freelancer, Optimizely**



Some providers are using custom authorization parameter to pass the requested scopes - Flickr `perms`, Freelancer `advanced_scopes`, Optimizely `scopes`, but you can use the regular `scope` option instead:



```json

"flickr": {

  "scope": ["write"]

},

"freelancer": {

  "scope": ["1", "2"]

},

"optimizely": {

  "scope": ["all"]

}

```



> **Mastodon**



Mastodon requires the entire domain of your server to be embedded in the OAuth URLs. However you should use the `subdomain` option:



```json

"mastodon": {

  "subdomain": "mastodon.cloud"

}

```



> **Openstreetmap**



Openstreetmap OAuth 2.0 applications have to use the `openstreetmap2` provider:



```json

"openstreetmap2": {

  "state": true,

  "scope": [

    "openid",

    "read_prefs"

  ]

}

```



> **SurveyMonkey**



Set your Mashery user name as `key` and your application key as `api_key`:



```json

"surveymonkey": {

  "key": "MASHERY_USER_NAME",

  "secret": "CLIENT_SECRET",

  "custom_params": {"api_key": "CLIENT_ID"}

}

```



> **Twitter**



Twitter OAuth 1.0a custom scope parameter can be specified in two ways:



```json

"twitter": {

  "custom_params": {"x_auth_access_type": "read"}

}

"twitter": {

  "scope": ["read"]

}

```



Twitter OAuth 2.0 applications have to use the `twitter2` provider:



```json

"twitter2": {

  "state": true,

  "pkce": true,

  "scope": [

    "users.read",

    "tweet.read"

  ]

}

```



> **VisualStudio**



Set your Client Secret as `secret` not the App Secret:



```json

"visualstudio": {

  "key": "APP_ID",

  "secret": "CLIENT_SECRET instead of APP_SECRET"

}

```



---



  [npm-version]: https://img.shields.io/npm/v/grant.svg?style=flat-square (NPM Version)

  [test-ci-img]: https://img.shields.io/github/actions/workflow/status/simov/grant/test.yml?style=flat-square (Build Status)

  [test-cov-img]: https://img.shields.io/coveralls/simov/grant.svg?style=flat-square (Test Coverage)

  [snyk-vulnerabilities]: https://img.shields.io/badge/vulnerabilities-0-geen?style=flat-square (Vulnerabilities)



  [npm]: https://www.npmjs.com/package/grant

  [test-ci-url]: https://github.com/simov/grant/actions/workflows/test.yml

  [test-cov-url]: https://coveralls.io/r/simov/grant?branch=master

  [snyk]: https://snyk.io/test/npm/grant



  [grant-oauth]: https://grant.outofindex.com

  [oauth-like-a-boss]: https://dev.to/simov/oauth-like-a-boss-2m3b

  [http client]: https://github.com/simov/request-compose

  [request logs]: https://github.com/simov/request-logs



  [oauth.json]: https://github.com/simov/grant/blob/master/config/oauth.json

  [profile.json]: https://github.com/simov/grant/blob/master/config/profile.json

  [reserved-keys]: https://github.com/simov/grant/blob/master/config/reserved.json

  [examples]: https://github.com/simov/grant/tree/master/examples

  [changelog]: https://github.com/simov/grant/blob/master/CHANGELOG.md

  [migration]: https://github.com/simov/grant/blob/master/MIGRATION.md



  [grant-aws]: https://github.com/simov/grant-aws

  [grant-azure]: https://github.com/simov/grant-azure

  [grant-gcloud]: https://github.com/simov/grant-gcloud

  [grant-vercel]: https://github.com/simov/grant-vercel



  [grant-types]: https://github.com/simov/grant-types

  [type-definitions]: https://github.com/simov/grant/blob/master/grant.d.ts