---
sidebar_label: Coverage.startJSCoverage
---
# Coverage.startJSCoverage() method

**Signature:**

```typescript
class Coverage {startJSCoverage(options?: JSCoverageOptions): Promise<void>;}
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  options | [JSCoverageOptions](./puppeteer.jscoverageoptions.md) | <i>(Optional)</i> Set of configurable options for coverage defaults to <code>resetOnNavigation : true, reportAnonymousScripts : false</code> |

**Returns:**

Promise&lt;void&gt;

Promise that resolves when coverage is started.

## Remarks

Anonymous scripts are ones that don't have an associated url. These are scripts that are dynamically created on the page using `eval` or `new Function`. If `reportAnonymousScripts` is set to `true`, anonymous scripts will have `pptr://__puppeteer_evaluation_script__` as their URL.