puppeteer/docs/api/puppeteer.coverage.startjscoverage.md

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---
sidebar_label: Coverage.startJSCoverage
---
# Coverage.startJSCoverage() method
#### Signature:
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```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> <code>includeRawScriptCoverage : false, useBlockCoverage : true</code> |
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**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 URL will start with `debugger://VM` (unless a magic //\# sourceURL comment is present, in which case that will the be URL).