> For the complete documentation index, see [llms.txt](https://fusionauth.io/docs/llms.txt)

# API

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

[.NET API .NET API](https://fusionauth.io/docs/get-started/quickstarts/api/quickstart-dotnet-api.md)

[Golang API Golang API](https://fusionauth.io/docs/get-started/quickstarts/api/quickstart-golang-api.md)

[Laravel API Laravel API](https://fusionauth.io/docs/get-started/quickstarts/api/quickstart-php-laravel-api.md)

[Node/Express API Node/Express API](https://fusionauth.io/docs/get-started/quickstarts/api/quickstart-javascript-express-api.md)

[Ruby on Rails API Ruby on Rails API](https://fusionauth.io/docs/get-started/quickstarts/api/quickstart-ruby-on-rails-api.md)

[Spring Boot API Spring Boot API](https://fusionauth.io/docs/get-started/quickstarts/api/quickstart-java-springboot-api.md)