Where to store refresh_token?

[usender]

Hello. I have a question about refresh_token.
If you connect angular UI to API services, after login, we get the response:
{
"access_token": "some_code",
"refresh_token": "another_token",
"expire": 2900
}

access_token will be saved in LocalStorage.
Where will refresh_token be saved?

If it is stored in the LocalStorage, then what about security?