---
title: "Reference"
description: "URL variables, matching rules, feature flags, best practices, SDK API."
url: "https://www.contentstack.com/docs/studio/reference-guide"
product: "Contentstack"
doc_type: "guide"
audience:
  - developers
  - admins
version: "current"
last_updated: "2026-09-14"
---

# Reference

URL variables, matching rules, feature flags, best practices, SDK API.

## On this chapter

### Authoring references

*   [URL variables](/docs/studio/url-variables-reference): Every variable accepted inside a composition URL pattern, grouped by category.
*   [Linked-schema matching rules](/docs/studio/linked-schema-matching-rules): The full algorithm Studio applies to determine which template fields a section can bind to.
*   [Feature flags](/docs/studio/control-features-with-feature-flags): Complete list of stack- and project-level gates that hide or change Studio's UI.
*   [Studio provisioning API](/docs/studio/studio-provisioning-api): The host map across regions, the non-production host pattern, and the /v1/projects request shape.

### Patterns and code

*   [Best practices](/docs/studio/apply-studio-development-best-practices): Consolidated patterns that work and anti-patterns to avoid, organized by topic.
*   [SDK API Reference](/docs/studio/sdk-api-reference): Complete public surface of @contentstack/studio-react, taken from the type definitions.
*   [<StudioComponent /> reference](/docs/studio/composition-rendering-reference): Everything the route-rendering component accepts, plus the fetchCompositionData query surface.
*   [<StudioComposition /> reference](/docs/studio/studio-composition-props-reference): The bring-your-own-data component and the spec-only fetchComposition fetcher.
*   [<Slot> reference](/docs/studio/slot-props-reference): Data-carrying slots. The data + children props and the nearest-wins merge.

## See also

*   [Docs home](/docs/studio/studio-documentation-home)
*   [Sections](/docs/studio/link-content-types-with-linked-schema): conceptual companion to the matching-rules reference.