> 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/sdk/domains-api/tossauth/tossauth.login.md).

# TossAuth.login

> 함수형 API `appLogin`으로도 같은 기능을 쓸 수 있어요.

### 기능 설명

토스 인증으로 로그인해요. 로그인이 완료되면 다시 토스 앱으로 이동해요. 반환된 `authorizationCode`와 `referrer`를 서버로 전달해 로그인 처리를 이어가면 돼요.

### 타입

```ts
TossAuth.login(): Promise<AppLoginResponse>;
```

**Params**

없음

**Response**

```ts
type AppLoginResponse = {
  authorizationCode: string;
  referrer: "DEFAULT" | "SANDBOX";
};
```

### 예시 코드

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

const button = document.querySelector("#login-button");

button.addEventListener("click", async () => {
  try {
    const { authorizationCode, referrer } = await TossAuth.login();
    // authorizationCode와 referrer를 서버로 전달해요
  } catch (error) {
    console.error(error);
  }
});
```


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