> ## Documentation Index
> Fetch the complete documentation index at: https://developer.upsun.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How Meta-Upsun improved Validation Schema and Developer eXperience

> The introduction of Meta-Upsun enabled dynamic validation schemas and version enumeration for Upsun services and runtimes, significantly improving developer experience.


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<PostMeta data={{ author: ["flovntp"], date: "2026-04-07T12:00:00.000Z" }} />

The release of [Meta-Upsun](https://devcenter.upsun.com/posts/meta-reference-source-introduction/) marks a major advancement in Upsun’s validation capabilities. Developers no longer need to manually check [Upsun documentation](https://developer.upsun.com/docs) or risk using unsupported versions for services and runtimes. Meta-Upsun provides dynamic, always up-to-date validation schemas for services and runtimes, ensuring configuration is accurate and reliable.

## Schemastore update

[Schemastore.org](https://www.schemastore.org/) now links directly to the Upsun validation schema streamlining configuration of `config.yaml` files. This integration ensures developers receive the latest validation rules and best practices, as detailed in our [developer guide](https://devcenter.upsun.com/posts/validate-yaml-config/).

The Schemastore entry for Upsun now references our [dedicated API endpoint](https://meta.upsun.com/api-docs#tag/validation/GET/schema/upsun), so your IDE always uses the most current schema.

The updated validation schema uses `$ref` pointers for service and runtime types, linking to Meta-Upsun API endpoints that enumerate the latest supported versions. See below for examples of the schema definitions:

<img src="https://mintcdn.com/upsun-c9761871/YEOzW9DxF0TmbjEQ/images/posts/how-tos/meta/meta-dx-validation-schema-runtime-ref.png?fit=max&auto=format&n=YEOzW9DxF0TmbjEQ&q=85&s=2ca4471744db8e3e64792d802abf023d" alt="Sample of the runtime type validation schema definition" width="1188" height="266" data-path="images/posts/how-tos/meta/meta-dx-validation-schema-runtime-ref.png" />

<img src="https://mintcdn.com/upsun-c9761871/YEOzW9DxF0TmbjEQ/images/posts/how-tos/meta/meta-dx-validation-schema-service-ref.png?fit=max&auto=format&n=YEOzW9DxF0TmbjEQ&q=85&s=d4e5fe60a3f6a207ac0df0055d74ae1a" alt="Sample of the service type validation schema definition" width="998" height="328" data-path="images/posts/how-tos/meta/meta-dx-validation-schema-service-ref.png" />

## Dynamic version enumeration via API

Meta-Upsun introduces two new endpoints:

* [`GET /validation/schema/runtime-versions`](https://meta.upsun.com/api-docs#tag/validation/GET/schema/runtime-versions)
  <img src="https://mintcdn.com/upsun-c9761871/YEOzW9DxF0TmbjEQ/images/posts/how-tos/meta/meta-dx-runtime-enum.png?fit=max&auto=format&n=YEOzW9DxF0TmbjEQ&q=85&s=7164ca4c6a317479c23b2dec1a4dc1a4" alt="Sample of the runtime API endpoint enum result" width="532" height="898" data-path="images/posts/how-tos/meta/meta-dx-runtime-enum.png" />
  * [`GET /validation/schema/service-versions`](https://meta.upsun.com/api-docs#tag/validation/GET/schema/service-versions)
    <img src="https://mintcdn.com/upsun-c9761871/YEOzW9DxF0TmbjEQ/images/posts/how-tos/meta/meta-dx-service-enum.png?fit=max&auto=format&n=YEOzW9DxF0TmbjEQ&q=85&s=ec081448a8daca10e180d4f48f0aad95" alt="Sample of the service API endpoint enum result" width="610" height="760" data-path="images/posts/how-tos/meta/meta-dx-service-enum.png" />
    These endpoints pull data from [registry.json](https://meta.upsun.com/api-docs#tag/images/GET/image), ensuring the list of valid versions is always up-to-date and reflects actual platform support.

## Smarter validation schema

The main schema ([`GET /validation/schema/upsun`](https://meta.upsun.com/api-docs#tag/validation/GET/schema/upsun)) dynamically references these endpoints. Whether you specify a runtime or service, you get the correct, current version enumeration automatically.

## Better Developer eXperience (DX)

With dynamic schema integration in your IDE, you’re prevented from specifying unsupported versions and no longer need to search documentation for valid options. The schema guides you, reducing errors and saving time.

Below are examples of how autocompletion works for runtime and service types in Visual Studio Code:

**Example for Runtime type autocomplete in Visual Studio Code**:

<img src="https://mintcdn.com/upsun-c9761871/YEOzW9DxF0TmbjEQ/images/posts/how-tos/meta/meta-dx-runtime-autocomplete.png?fit=max&auto=format&n=YEOzW9DxF0TmbjEQ&q=85&s=b1c411c73a5385933fa652bba2f49671" alt="Example of a runtime.type autocomplete in VSCode" width="1092" height="558" data-path="images/posts/how-tos/meta/meta-dx-runtime-autocomplete.png" />

**Example for Service type autocomplete in Visual Studio Code**:

<img src="https://mintcdn.com/upsun-c9761871/YEOzW9DxF0TmbjEQ/images/posts/how-tos/meta/meta-dx-service-autocomplete.png?fit=max&auto=format&n=YEOzW9DxF0TmbjEQ&q=85&s=c2f7d3a947e8d45f2fa92de46843b424" alt="Example of a service.type autocomplete in VSCode" width="1040" height="568" data-path="images/posts/how-tos/meta/meta-dx-service-autocomplete.png" />

Meta-Upsun’s enhancements to validation and version management represent a significant leap for Upsun’s developer experience, making configuration safer, faster, and more reliable.

To learn more about Upsun, visit our comprehensive [documentation](https://developer.upsun.com/docs).