openid-client

openid-client

OAuth 2 / OpenID Connect Client API for JavaScript Runtimes

openid-client simplifies integration with authorization servers by providing easy-to-use APIs for the most common authentication and authorization flows, including OAuth 2 and OpenID Connect. It is designed for JavaScript runtimes like Node.js, Browsers, Deno, Cloudflare Workers, and more.

Features

The following features are currently in scope and implemented in this software:

• Authorization Server Metadata discovery
• Authorization Code Flow (profiled under OpenID Connect 1.0, OAuth 2.0, OAuth 2.1, FAPI 1.0 Advanced, and FAPI 2.0)
• Refresh Token, Device Authorization, Client-Initiated Backchannel Authentication (CIBA), and Client Credentials Grants
• Demonstrating Proof-of-Possession at the Application Layer (DPoP)
• Token Introspection and Revocation
• Pushed Authorization Requests (PAR)
• UserInfo and Protected Resource Requests
• Authorization Server Issuer Identification
• JWT Secured Introspection, Response Mode (JARM), Authorization Request (JAR), and UserInfo
• Dynamic Client Registration (DCR)
• Passport Strategy

Sponsor

If you want to quickly add authentication to JavaScript apps, feel free to check out Auth0's JavaScript SDK and free plan. Create an Auth0 account; it's free!

Certification

Filip Skokan has certified that this software conforms to the Basic, FAPI 1.0, and FAPI 2.0 Relying Party Conformance Profiles of the OpenID Connect™ protocol.

Help the project

Support from the community to continue maintaining and improving this module is welcome. If you find the module useful, please consider supporting the project by becoming a sponsor.

API Reference Documentation

openid-client is distributed via npmjs.com, jsr.io, and github.com.

Examples

example ESM import[^cjs]

import * as client from 'openid-client'

• Authorization Code Flow (OAuth 2.0) - source
• Authorization Code Flow (OpenID Connect) - source | diff
• Extensions
  • DPoP - source | diff
  • JWT Secured Authorization Request (JAR) - source | diff
  • JWT Secured Authorization Response Mode (JARM) - source | diff
  • Pushed Authorization Request (PAR) - source | diff
• Passport Strategy - source

Quick start

let server!: URL // Authorization Server's Issuer Identifier
let clientId!: string // Client identifier at the Authorization Server
let clientSecret!: string // Client Secret

let config: client.Configuration = await client.discovery(
  server,
  clientId,
  clientSecret,
)

Authorization Code Flow

Authorization Code flow is for obtaining Access Tokens (and optionally Refresh Tokens) to use with third party APIs.

When you want to have your end-users authorize or authenticate you need to send them to the authorization server's authorization_endpoint. Consult the web framework of your choice on how to redirect but here's how to get the authorization endpoint's URL with parameters already encoded in the query to redirect to.

…

When end-users are redirected back to the redirect_uri your application consumes the callback and passes in PKCE code_verifier to include it in the authorization code grant token exchange.

let getCurrentUrl!: (...args: any) => URL

let tokens: client.TokenEndpointResponse = await client.authorizationCodeGrant(
  config,
  getCurrentUrl(),
  {
    pkceCodeVerifier: code_verifier,
    expectedState: state,
  },
)

console.log('Token Endpoint Response', tokens)

You can then fetch a protected resource response

let protectedResourceResponse: Response = await client.fetchProtectedResource(
  config,
  tokens.access_token,
  new URL('https://rs.example.com/api'),
  'GET',
)

console.log(
  'Protected Resource Response',
  await protectedResourceResponse.json(),
)

Device Authorization Grant (Device Flow)

let scope!: string // Scope of the access request

let response = await client.initiateDeviceAuthorization(config, { scope })

console.log('User Code:', response.user_code)
console.log('Verification URI:', response.verification_uri)
console.log('Verification URI (complete):', response.verification_uri_complete)

You will display the instructions to the end-user and have them directed at verification_uri or verification_uri_complete, afterwards you can start polling for the Device Access Token Response.

let tokens: client.TokenEndpointResponse =
  await client.pollDeviceAuthorizationGrant(config, response)

console.log('Token Endpoint Response', tokens)

This will poll in a regular interval and only resolve with tokens once the end-user authenticates.

Client-Initiated Backchannel Authentication (CIBA)

…

This will poll in a regular interval and only resolve with tokens once the end-user authenticates.

Client Credentials Grant

Client Credentials flow is for obtaining Access Tokens to use with third party APIs on behalf of your application, rather than an end-user which was the case in previous examples.

let scope!: string // Scope of the access request
let resource!: string // Resource Indicator of the Resource Server the access token is for

let tokens: client.TokenEndpointResponse = await lib.clientCredentialsGrant(
  config,
  { scope, resource },
)

console.log('Token Endpoint Response', tokens)

Supported Runtimes

The supported JavaScript runtimes include those that support the utilized Web API globals and standard built-in objects. These are (but are not limited to):

• Browsers
• Bun
• Cloudflare Workers
• Deno
• Electron
• Node.js[^nodejs]

Supported Versions

Version	Security Fixes	Other Bug Fixes	New Features ⭐	Runtime and Module type
v6.x	Security Policy	✅	✅	Universal[^universal] ESM[^cjs]

[^nodejs]: Node.js v20.x as baseline is required

[^universal]: Assumes runtime support of WebCryptoAPI and Fetch API

[^cjs]: CJS style let client = require('openid-client') is possible in Node.js versions where the require(esm) feature is enabled by default (^20.19.0 || ^22.12.0 || >= 23.0.0).