FusionAuth developer image
FusionAuth developer logo
  • Back to site
  • Expert Advice
  • Blog
  • Developers
  • Downloads
  • Account
  • Contact sales
Navigate to...
  • Welcome
  • Getting Started
  • 5-Minute Setup Guide
  • Release Notes
  • Core Concepts
    • Overview
    • Users
    • Roles
    • Groups
    • Entity Management
    • Registrations
    • Applications
    • Tenants
    • Identity Providers
    • Key Master
    • SCIM
    • Search
    • Authentication and Authorization
    • Integration Points
    • Localization and Internationalization
    • Editions and Features
    • Roadmap
  • Installation Guide
    • Overview
    • System Requirements
    • Server Layout
    • Cloud
    • Cluster
    • Docker
    • Fast Path
    • Kubernetes
      • Overview
      • Deployment Guide
      • Minikube Setup
      • Amazon EKS Setup
      • Google GKE Setup
      • Microsoft AKS Setup
    • Kickstart™
    • Homebrew
    • Packages
    • Database
    • FusionAuth App
    • FusionAuth Search
    • Common Configuration
  • Admin Guide
    • Overview
    • Config Management
    • Licensing
    • Monitoring
    • Proxy Setup
    • Securing
    • Technical Support
    • Troubleshooting
    • Upgrading
  • Migration Guide
    • Overview
    • General
    • Auth0
    • Keycloak
    • Amazon Cognito
    • Tutorial
  • APIs
    • Overview
    • Authentication
    • Errors
    • Actioning Users
    • API Keys
    • Applications
    • Audit Logs
    • Connectors
      • Overview
      • Generic
      • LDAP
    • Consents
    • Emails
    • Entity Management
      • Overview
      • Entities
      • Entity Types
      • Grants
    • Event Logs
    • Families
    • Forms
    • Form Fields
    • Groups
    • Identity Providers
      • Overview
      • Links
      • Apple
      • External JWT
      • Epic Games
      • Facebook
      • Google
      • HYPR
      • LinkedIn
      • Nintendo
      • OpenID Connect
      • SAML v2
      • SAML v2 IdP Initiated
      • Sony PlayStation Network
      • Steam
      • Twitch
      • Twitter
      • Xbox
    • Integrations
    • IP Access Control Lists
    • JWT
    • Keys
    • Lambdas
    • Login
    • Message Templates
    • Messengers
      • Overview
      • Generic
      • Kafka
      • Twilio
    • Multi-Factor/Two Factor
    • Passwordless
    • Reactor
    • Registrations
    • Reports
    • SCIM
      • Overview
      • SCIM EnterpriseUser
      • SCIM Group
      • SCIM Service Provider Config.
      • SCIM User
    • System
    • Tenants
    • Themes
    • Users
    • User Actions
    • User Action Reasons
    • User Comments
    • Webhooks
  • Client Libraries
    • Overview
    • Dart
    • Go
    • Java
    • JavaScript
    • .NET Core
    • Node
    • OpenAPI
    • PHP
    • Python
    • Ruby
    • Typescript
  • Themes
    • Overview
    • Examples
    • Helpers
    • Localization
    • Template Variables
  • Email & Templates
    • Overview
    • Configure Email
    • Email Templates
    • Email Variables
    • Message Templates
  • Events & Webhooks
    • Overview
    • Writing a Webhook
    • Securing Webhooks
    • Events
      • Overview
      • Audit Log Create
      • Event Log Create
      • JWT Public Key Update
      • JWT Refresh
      • JWT Refresh Token Revoke
      • Kickstart Success
      • User Action
      • User Bulk Create
      • User Create
      • User Create Complete
      • User Deactivate
      • User Delete
      • User Delete Complete
      • User Email Update
      • User Email Verified
      • User IdP Link
      • User IdP Unlink
      • User Login Failed
      • User Login Id Duplicate Create
      • User Login Id Duplicate Update
      • User Login New Device
      • User Login Success
      • User Login Suspicious
      • User Password Breach
      • User Password Reset Send
      • User Password Reset Start
      • User Password Reset Success
      • User Password Update
      • User Reactivate
      • User Registration Create
      • User Registration Create Complete
      • User Registration Delete
      • User Registration Delete Complete
      • User Registration Update
      • User Registration Update Complete
      • User Registration Verified
      • User Two Factor Method Add
      • User Two Factor Method Remove
      • User Update
      • User Update Complete
  • Example Apps
    • Overview
    • Dart
    • Go
    • Java
    • JavaScript
    • .NET Core
    • PHP
    • Python
    • Ruby
  • Lambdas
    • Overview
    • Apple Reconcile
    • Client Cred. JWT Populate
    • Epic Games Reconcile
    • External JWT Reconcile
    • Facebook Reconcile
    • Google Reconcile
    • HYPR Reconcile
    • JWT Populate
    • LDAP Connector Reconcile
    • LinkedIn Reconcile
    • Nintendo Reconcile
    • OpenID Connect Reconcile
    • SAML v2 Populate
    • SAML v2 Reconcile
    • SCIM Group Req. Converter
    • SCIM Group Resp. Converter
    • SCIM User Req. Converter
    • SCIM User Resp. Converter
    • Sony PSN Reconcile
    • Steam Reconcile
    • Twitch Reconcile
    • Twitter Reconcile
    • Xbox Reconcile
  • Identity Providers
    • Overview
    • Apple
    • Epic Games
    • External JWT
      • Overview
      • Example
    • Facebook
    • Google
    • HYPR
    • LinkedIn
    • Nintendo
    • OpenID Connect
      • Overview
      • Azure AD
      • Discord
      • Github
    • Sony PlayStation Network
    • Steam
    • Twitch
    • Twitter
    • SAML v2
      • Overview
      • ADFS
    • SAML v2 IdP Initiated
      • Overview
      • Okta
    • Xbox
  • Messengers
    • Overview
    • Generic Messenger
    • Kafka Messenger
    • Twilio Messenger
  • Connectors
    • Overview
    • Generic Connector
    • LDAP Connector
    • FusionAuth Connector
  • Self Service Account Mgmt
    • Overview
    • Updating User Data & Password
    • Add Two-Factor Authenticator
    • Add Two-Factor Email
    • Add Two-Factor SMS
    • Customizing
    • Troubleshooting
  • Advanced Threat Detection
    • Overview
  • Integrations
    • Overview
    • CleanSpeak
    • Kafka
    • Twilio
  • OpenID Connect & OAuth 2.0
    • Overview
    • Endpoints
    • Tokens
  • SAML v2 IdP
    • Overview
    • Google
    • Zendesk
  • Plugins
    • Plugins
    • Writing a Plugin
    • Custom Password Hashing
  • Guides
    • Overview
    • Advanced Registration Forms
    • Breached Password Detection
    • Multi-Factor Authentication
    • Multi-Tenant
    • Passwordless
    • Securing Your APIs
    • Silent Mode
    • Single Sign-on
  • Tutorials
    • Overview
    • User Control & Gating
      • Gate Unverified Users
      • Gate Unverified Registrations
      • User Account Lockout
    • Setup Wizard & First Login
    • Register/Login a User
    • Start and Stop FusionAuth
    • Authentication Tokens
    • Key Rotation
    • JSON Web Tokens
    • Prometheus Setup
    • Switch Search Engines
    • Two Factor (pre 1.26)
  • Reference
    • CORS
    • Configuration
    • Data Types
    • Known Limitations
    • Password Hashes

    FusionAuth JavaScript Client

    The following client library is now deprecated in favor of the typescript client, as it can do everything this project can but with better type support and examples.

    JavaScript Client Library

    The JavaScript client library allows you to integrate FusionAuth with your JavaScript application.

    Source Code:

    • https://github.com/FusionAuth/fusionauth-javascript-client

    Please note that if you will be using this client library in front end code such as a web browser you will not have a secure way to store an API key. You may optionally pass a value of null for the API key parameter and still make API requests that do not require an API key.

    The following code assumes FusionAuth is running on http://localhost:9011 and uses an API key 6b87a398-39f2-4692-927b-13188a81a9a3, you will need to supply your own API key, and if you are not running FusionAuth locally, your host parameter may be different.

    Here is an example of using the retrieveUserByEmail method to retrieve a User by an email address.

    <html>
      <head>
        <script src="../lib/ClientResponse.js"></script>
        <script src="../lib/RESTClient.js"></script>
        <script src="../lib/FusionAuthClient.js"></script>
        <script>
          var client = new FusionAuthClient('6b87a398-39f2-4692-927b-13188a81a9a3', 'http://localhost:9011');
          function handleResponse (clientResponse) {
            console.info(JSON.stringify(clientResponse.successResponse.user, null, 2));
          }
    
          // Retrieve User by Email Address
          client.retrieveUserByEmail('user@example.com', handleResponse);
        </script>
      </head>
      <body>
        Super Awesome Application
      </body>
    </html>

    Client Authentication

    You may use this client library in an application that cannot securely store secrets, such as a native mobile application or a single page application running in the browser.

    In this scenario, you should disable Require authentication in the FusionAuth Application configuration and use PKCE to secure communication with the Token endpoint.

    You can use the exchangeOAuthCodeForAccessTokenUsingPKCE client method to do so.

    Feedback

    How helpful was this page?

    See a problem?

    File an issue in our docs repo

    © 2021 FusionAuth
    Subscribe for developer updates