---
area: "API"
parent: "API"
url: "https://unpoly.com/api/formats"
---
<nav aria-label="Unpoly docs">[All docs](https://unpoly.com/index.md) · [API](https://unpoly.com/api.md)</nav>

# Formats

Mini-languages used throughout the API.

## [URL patterns](https://unpoly.com/api/url-patterns.md)

Some Unpoly features let you match a URL using _URL patterns_. You can use them to define overlay close conditions, or when adding aliases to navigation items.

## [Relaxed JSON](https://unpoly.com/api/relaxed-json.md)

_Relaxed JSON_ is a JSON superset that aims to be easier to write by humans.