# API

Explore step-by-step API QuickStart guides from FusionAuth to seamlessly integrate authentication into your application.

> For the index of this section of the site, see [llms.txt](https://fusionauth.io/docs/llms.txt)

[.NET API QuickStart integration of .NET Web API with FusionAuth.](https://fusionauth.io/docs/quickstarts/api/quickstart-dotnet-api.md)

[Golang API QuickStart integration of a Golang API application using FusionAuth as a resource server.](https://fusionauth.io/docs/quickstarts/api/quickstart-golang-api.md)

[Laravel API QuickStart integration of a Laravel API application using FusionAuth.](https://fusionauth.io/docs/quickstarts/api/quickstart-php-laravel-api.md)

[Node.js/Express.js API QuickStart integration of a JavaScript Express.js API application action as a resource server with FusionAuth.](https://fusionauth.io/docs/quickstarts/api/quickstart-javascript-express-api.md)

[Ruby on Rails API QuickStart Integration of a Ruby on Rails API with FusionAuth.](https://fusionauth.io/docs/quickstarts/api/quickstart-ruby-on-rails-api.md)

[Spring Boot API QuickStart integration of a Spring Boot API application action as a resource server with FusionAuth.](https://fusionauth.io/docs/quickstarts/api/quickstart-java-springboot-api.md)

Related

[APIs Authenticate with our APIs Learn how the FusionAuth APIs authenticate requests. api authenticationfusionauth apirest api](https://fusionauth.io/docs/apis/authentication.md)

[APIs Hosted Backend API Learn about the APIs that you to perform OAuth2 Authorization Code Flow login, logout, and refresh for applications. fusionauth apirest apibackend api](https://fusionauth.io/docs/apis/hosted-backend.md)

[APIs User Action API Learn about the APIs for invoking a User Action on a User. fusionauth apirest api](https://fusionauth.io/docs/apis/actioning-users.md)

[APIs Create an API Key API API documentation for the FusionAuth Create an API Key API. fusionauth apirest api](https://fusionauth.io/docs/apis/api-keys/create-an-api-key.md)
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## Other pages in Quickstarts

> For the full index of this section, see [Quickstarts](https://fusionauth.io/docs/llms-quickstarts.txt).

- [App](https://fusionauth.io/docs/quickstarts/app.md): Explore step-by-step application QuickStart guides from FusionAuth to seamlessly integrate authentication into your application.
- [Single-page App](https://fusionauth.io/docs/quickstarts/spa.md): Explore step-by-step single-page application QuickStart guides from FusionAuth to seamlessly integrate authentication into your application.
- [Web](https://fusionauth.io/docs/quickstarts/web.md): Explore step-by-step web application QuickStart guides from FusionAuth to seamlessly integrate authentication into your application.