If a backend APIs are already available, you can interact with them, and include the API responses and create dynamic web pages. Checkout the [http processor](/http/) about how to do this. `fastn` also has support for `endpoint` definitions, which allows frontend code to communicate with existing APIs without worrying about cross origin policies and exposing a unified domain. Read about it in the [endpoint guide](/endpoint/).

`fastn` by default generates URLs of your webpages based on the file path, but you can define dynamic URLs to create beautiful URLs independent of file organisation, or to create documents that is served when any URLs matching some pattern is accessed. Read more about it in our [Dynamic URLs Guide](/dynamic-urls/).

When rendering any `fastn document` you can use `request data processor` to extract request data like URL, query parameter etc, and use it with your APIs or queries. Read more about [Request Data Processor](/request-data/).

`fastn` can be used to query data from sqlite database to generate dynamic websites. Read more about our [package query processor](/package-query/).

`fastn` can also read data in JSON files that are part of your package to help you create data visualisation websites. Read more about [reading JSON](/get-data/).