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

# Valid URLs

> Learn how to use the valid URLs test

## Definition

The valid URL test allows you to check if a specified column contains only valid URLs.

## Taxonomy

* **Task types**: LLM.
* **Availability**: <Tooltip tip="Continuously evaluate your models and datasets as you iterate on their versions.">development</Tooltip>
  and <Tooltip tip="Monitor a model in production, measure its health, check for drifts and set up alerts.">monitoring</Tooltip>.

## Why it matters

* If the LLM generates URLs as part of its response, it is important to ensure that they are valid, and not hallucinated.

## Test configuration examples

If you are writing a `tests.json`, here are a few valid configurations for the character length test:

<CodeGroup>
  ```json Development theme={null}
  [
    {
      "name": "Column 'model_url' contains only valid URLs",
      "description": "Asserts that all values in the column 'model_url' are valid URLs",
      "type": "integrity",
      "subtype": "containsValidUrl",
      "thresholds": [
          {
              "insightName": "containsValidUrl",
              "insightParameters": [{"name": "column_name", "value": "model_url"}],  // Checks for URLs on the column `model_url`,
              "measurement": "containsValidUrlRowPercentage",
              "operator": ">=",
              "value": 1.0
          }
      ],
      "subpopulationFilters": null,
      "mode": "development",
      "usesValidationDataset": true, // Apply test to the validation set
      "usesTrainingDataset": false,
      "usesMlModel": false,
      "syncId": "b4dee7dc-4f15-48ca-a282-63e2c04e0689" // Some unique id
    }
  ]

  ```

  ```json Monitoring theme={null}
  [
    {
      "name": "Column 'model_url' contains only valid URLs",
      "description": "Asserts that all values in the column 'model_url' are valid URLs",
      "type": "integrity",
      "subtype": "containsValidUrl",
      "thresholds": [
          {
              "insightName": "containsValidUrl",
              "insightParameters": [{"name": "column_name", "value": "model_url"}],  // Checks for URLs on the column `model_url`,
              "measurement": "containsValidUrlRowPercentage",
              "operator": ">=",
              "value": 1.0
          }
      ],
      "subpopulationFilters": null,
      "mode": "monitoring",
      "usesProductionData": true,
      "evaluationWindow": 3600, // 1 hour
      "delayWindow": 0,
      "syncId": "b4dee7dc-4f15-48ca-a282-63e2c04e0689" // Some unique id
    }
  ]
  ```
</CodeGroup>