> For the complete documentation index, see [llms.txt](https://developers-apps-in-toss.toss.im/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers-apps-in-toss.toss.im/documentation/api-and-sdk-en/sdk/domains-api/analytics/analytics.log.md).

# Analytics.log

> Functional API `eventLog`You can use the same feature with it as well.

### Feature description

Logs events occurring in the app. You can record various types such as debugging, info, warning, error, screen, impression, and click. In the sandbox environment, they are output to the console, and in the production environment, they are recorded in the logging system.

`params`for user identification `anonymous_key`is automatically included as a default parameter. If you pass the same key directly, the value you pass takes precedence. `undefined` The value is removed before transmission, and all remaining values are normalized to strings.

Toss app Android/iOS `5.208.0` It can be used in version X and above. In unsupported versions, logs are quietly ignored without an error.

### Type

```ts
Analytics.log(params: EventLogParams): Promise<void>;
```

**Params**

```ts
type EventLogParams = {
  log_name: string;
  log_type:
    | "debug"
    | "info"
    | "warn"
    | "error"
    | "event"
    | "screen"
    | "impression"
    | "click"
    | "popup";
  params: Record<string, string | number | boolean | null | undefined>;
};
```

**Response**

None.

### Example code

#### JavaScript

```js
import { Analytics } from "@apps-in-toss/web-framework";

try {
  await Analytics.log({
    log_name: "user_action",
    log_type: "event",
    params: {
      action: "button_click",
      screen: "main",
      userId: 12345,
    },
  });
} catch (error) {
  console.error(error);
}
```


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