> For the complete documentation index, see [llms.txt](https://www.ngxs.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.ngxs.io/v18.0/plugins/logger.md).

# Logger

A simple console log plugin to log actions as they are processed.

## Installation

```bash
npm i @ngxs/logger-plugin

# or if you are using yarn
yarn add @ngxs/logger-plugin

# or if you are using pnpm
pnpm i @ngxs/logger-plugin
```

## Usage

When calling `provideStore`, include `withNgxsLoggerPlugin` in your app config:

```ts
import { provideStore } from '@ngxs/store';
import { withNgxsLoggerPlugin } from '@ngxs/logger-plugin';

export const appConfig: ApplicationConfig = {
  providers: [provideStore([], withNgxsLoggerPlugin())]
};
```

If you are still using modules, include the `NgxsLoggerPluginModule` plugin in your root app module:

```ts
import { NgxsModule } from '@ngxs/store';
import { NgxsLoggerPluginModule } from '@ngxs/logger-plugin';

@NgModule({
  imports: [NgxsModule.forRoot([]), NgxsLoggerPluginModule.forRoot()]
})
export class AppModule {}
```

### Options

The plugin supports the following options passed via the `forRoot` method:

* `logger`: Supply a different logger, useful for logging to backend. Defaults to `console`.
* `collapsed`: Collapse the log by default or not. Defaults to `true`.
* `disabled`: Disable the logger during production. Defaults to `false`.
* `filter`: Filter actions to be logged. Takes action and state snapshot as parameters. Default predicate returns `true` for all actions.

```ts
import { provideStore, getActionTypeFromInstance } from '@ngxs/store';
import { withNgxsLoggerPlugin } from '@ngxs/logger-plugin';

import { environment } from '../environments/environment';
import { customLogger } from './path/to/custom/logger';
import { SomeAction } from './path/to/some/action';

export const appConfig: ApplicationConfig = {
  providers: [
    provideStore(
      [],
      withNgxsLoggerPlugin({
        // Use customLogger instead of console
        logger: customLogger,
        // Do not collapse log groups
        collapsed: false,
        // Do not log in production mode
        disabled: environment.production,
        // Do not log SomeAction
        filter: action => getActionTypeFromInstance(action) !== SomeAction.type
      })
    )
  ]
};
```

Or with the module approach:

```ts
import { NgxsModule, getActionTypeFromInstance } from '@ngxs/store';
import { NgxsLoggerPluginModule } from '@ngxs/logger-plugin';

import { environment } from '../environments/environment';
import { customLogger } from './path/to/custom/logger';
import { SomeAction } from './path/to/some/action';

@NgModule({
  imports: [
    NgxsModule.forRoot([]),
    NgxsLoggerPluginModule.forRoot({
      // Use customLogger instead of console
      logger: customLogger,
      // Do not collapse log groups
      collapsed: false,
      // Do not log in production mode
      disabled: environment.production,
      // Do not log SomeAction
      filter: action => getActionTypeFromInstance(action) !== SomeAction.type
    })
  ]
})
export class AppModule {}
```

> The `filter` predicate takes state snapshot as the second parameter. This should prove useful for some edge cases. However, beware of the fact that the predicate is called for every action dispatched. You may consider using a memoized function for filters more complicated than a simple action comparison.

### Notes

You should always include the logger as the last plugin in your configuration. For instance, if you were to include logger before a plugin like the storage plugin, the initial state would not be reflected.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://www.ngxs.io/v18.0/plugins/logger.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.