> ## Documentation Index
> Fetch the complete documentation index at: https://www.getmaxim.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# isValidURL

> Validates if the given string is a valid URL.

## Input

* **`input`**: The original input text or data
* **`output`**: The URL string to validate
* **`expectedOutput`**: The expected output to compare against.

<Note>
  - Any of the input variables (`input`, `output`, `expectedOutput`) can be marked as optional.
  - The returned value from the `validate` function can be a boolean, string, or a number.
</Note>

## Output

* **`Result`**: Boolean (`true` or `false`) | string | number

## Interpretation

> Assuming this evaluator returns a boolean

* **true**: The string is a valid URL
* **false**: The string is not a valid URL

<Note>This evaluator requires a function named <code>validate</code>.</Note>

## Example

```python theme={null}
from urllib.parse import urlparse

def validate(input, actual_output, expected_output):
    """
    Returns True if actual_output is a syntactically valid URL with an allowed scheme and non-empty netloc.
    expected_output is unused for this evaluator but kept for interface consistency.
    """
    try:
        url = str(actual_output).strip()
        parsed = urlparse(url)
        return parsed.scheme in ("http", "https", "ftp") and bool(parsed.netloc)
    except Exception:
        return False
```