# Get Categories

`GET`

### Overview

Retrieve all event categories. Use this endpoint to build filters or navigation.

### Authentication

No authentication required.

### Request

* Method: `GET`
* Path: `/api/categories`
* Query parameters: None

### Response `200 OK`

```json
[
  {
    "i": "category-id",
    "n": "Crypto",
    "s": "crypto",
    "pi": null,
    "sc": [
      {
        "i": "sub-id",
        "n": "Bitcoin",
        "s": "bitcoin"
      }
    ]
  }
]
```

| Field | Type   | Description                   |
| ----- | ------ | ----------------------------- |
| i     | string | Category ID                   |
| n     | string | Category name                 |
| s     | string | Category slug                 |
| pi    | string | Parent category ID, or `null` |
| sc    | array  | Nested subcategories          |

### Error variants

Common public endpoint errors:

| Code | Description                         |
| ---- | ----------------------------------- |
| 400  | Bad Request — Invalid parameters    |
| 404  | Not Found — Resource does not exist |
| 500  | Internal Server Error               |

**Error response**

```json
{
  "status": 400,
  "error": "Bad Request",
  "message": "Invalid parameters"
}
```

### Python example

{% code title="get\_categories.py" %}

```python
import requests

response = requests.get(
    "https://event-service.outpoll.com/api/categories",
    timeout=10,
)
response.raise_for_status()

for category in response.json():
    print(f"{category['n']} ({category['s']})")
```

{% endcode %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.outpoll.com/api/rest-api/public-endpoints/get-categories.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.