---
description: Debug and test Matcho DSL patterns used in AccessPolicy and Subscriptions with the $matcho REST endpoint.
---

# $matcho

Matcho DSL is used to define rules for [AccessPolicy](../../../access-control/authorization/access-policies.md) resource.

## Definition

Matcho DSL syntax is described [here](../../../reference/matcho-dsl-reference.md).

## Debug endpoint

`POST /$matcho` is a REST endpoint to test matcho engine, which is used in AccessPolicy and Subscriptions.

```yaml
POST /$matcho

matcho: {'a': 1}
resource: {'a': 2}
context: { user: 'u-1' }

-- 

matcho: {a: 1}
resource: {a: 2}
result:
- expected: 1
  but: 2
  path: [a]
```