# Renewing Expired Tokens

Access Tokens and ID Tokens are valid for 1 hour. To generate new tokens, you need to use the Refresh Token.

## Renewing Tokens using the SDK

{% hint style="success" %}
Cotter's SDK generally handles this for you. Check the availability below.
{% endhint %}

{% tabs %}
{% tab title="React Native" %}
✅ Cotter's JavaScript SDK (from npm) **automatically renews your `access_token` and `id_token`** whenever there is a valid `refresh_token` in storage. 

This renewal is called when you call Cotter's Get Access Token function.

```javascript
cotter.tokenHandler.getAccessToken();
```

{% endtab %}

{% tab title="JavaScript (from npm)" %}
✅ Cotter's JavaScript SDK (from npm) **automatically renews your `access_token` and `id_token`** whenever there is a valid `refresh_token` in storage.

This renewal is called when you call [Cotter's Get Access Token function](https://docs.cotter.app/sdk-reference/web/getting-access-token-and-logged-in-user-info).

```javascript
cotter.tokenHandler.getAccessToken();
```

{% endtab %}

{% tab title="Flutter" %}
✅ Cotter's Flutter SDK **automatically renews your `access_token` and `id_token`** whenever there is a valid `refresh_token` in storage.

This renewal is called when you call [Cotter's Get Access Token function](https://docs.cotter.app/sdk-reference/flutter/getting-oauth-tokens).

```dart
var accessToken = await cotter.getAccessToken();
```

{% endtab %}

{% tab title="Other SDKs (coming soon)" %}
We'll add support for Android and iOS soon 😉. Stay tuned!
{% endtab %}
{% endtabs %}

## Renewing Tokens using Refresh Token

If Cotter's SDK doesn't support auto renewal, or if you you need to renew the tokens manually, you can make an HTTP request to Cotter's Server to renew the tokens using a `refresh_token`.

```javascript
curl -XPOST \
-H 'API_KEY_ID: <YOUR API KEY ID>' \
-H "Content-type: application/json" \
-d '{
  "grant_type": "refresh_token",
  "refresh_token": "<REFRESH_TOKEN>"
}' 'https://www.cotter.app/api/v0/token/<YOUR API KEY ID>'
```

## Get Token using Refresh Token

<mark style="color:green;">`POST`</mark> `https://www.cotter.app/api/v0/token/<YOUR API KEY ID>`

Getting new `access_token` and `id_token` using `refresh_token`

#### Path Parameters

| Name         | Type   | Description      |
| ------------ | ------ | ---------------- |
| API\_KEY\_ID | string | You `API_KEY_ID` |

#### Headers

| Name         | Type   | Description       |
| ------------ | ------ | ----------------- |
| Content-type | string | application/json  |
| API\_KEY\_ID | string | Your `API_KEY_ID` |

#### Request Body

| Name           | Type   | Description                   |
| -------------- | ------ | ----------------------------- |
| grant\_type    | string | Grant type is `refresh_token` |
| refresh\_token | string | Your `refresh_token`          |

{% tabs %}
{% tab title="200 Returns a new access\_token and id\_token. Does not return a new refresh\_token" %}

```javascript
{
  "access_token": "eyJhbGciOiJFU...",
  "auth_method": "OTP",
  "expires_in": 3600, // expiry in seconds
  "id_token": "eyJhbGciOiJFUzI1N...",
  "refresh_token": "235:s3kjlwkg035...",  // NEW refresh token
  "token_type": "Bearer"
}
```

{% endtab %}
{% endtabs %}

### Refresh Token Rotation

{% hint style="warning" %}
Note that **this does invalidates the old `refresh_token` and return a new `refresh_token`**
{% endhint %}

## **Renewing Expired Refresh Token**

When your `refresh_token` is expired, you have to re-authenticate your user. If you're using Trusted Devices and the current device is a trusted device, you can simply request authentication **silently, in the background by Signing in with Device.**