---
url: /config/onconsolelog.md
---

# onConsoleLog 

```ts
function onConsoleLog(
  log: string,
  type: 'stdout' | 'stderr',
  entity: TestModule | TestSuite | TestCase | undefined,
): boolean | void
```

Custom handler for `console` methods in tests. If you return `false`, Vitest will not print the log to the console. Note that Vitest ignores all other falsy values.

Can be useful for filtering out logs from third-party libraries.

```ts
import { defineConfig } from 'vitest/config'

export default defineConfig({
  test: {
    onConsoleLog(log: string, type: 'stdout' | 'stderr'): boolean | void {
      return !(log === 'message from third party library' && type === 'stdout')
    },
  },
})
```