## MedplumClient.ensureCodeChallenge() method

Returns the PKCE code challenge and method. If the login request already includes a code challenge, it is returned. Otherwise, a new PKCE code challenge is generated.

**Signature:**

```typescript
ensureCodeChallenge<T extends BaseLoginRequest>(loginRequest: T): Promise<T>;
```

## Parameters

| Parameter    | Type | Description                         |
| ------------ | ---- | ----------------------------------- |
| loginRequest | T    | The original login request.         |

**Returns:**

Promise<T>

The PKCE code challenge and method.

- [MedplumClient.ensureCodeChallenge() method](/content/docs/sdk/core.medplumclient.ensurecodechallenge#medplumclientensurecodechallenge-method/index.html)
- [Parameters](/content/docs/sdk/core.medplumclient.ensurecodechallenge#parameters/index.html)