How to retrieve refresh token from Google?

[aaaguirrep]

Hi, I am using openid-client library in my web application, I am authenticating the google users without issues but I can't retrieve refresh_token, I have tested the next code but I can't see refresh_token. I am using google as IDP.

    const login_url = client.authorizationUrl({
        scope: 'openid email profile',
        code_challenge,
        code_challenge_method: 'S256'
        access_type: 'offline'
    })

I have checked the documentation from google and it specifies to pass access_type to offline.
https://developers.google.com/identity/protocols/oauth2/openid-connect#refresh-tokens

Can you help me?

Thanks in advance.

Regards,
Arsenio

[panva]

Literally taken from the google docs you linked.

Refresh tokens
In your request for API access you can request a refresh token to be returned during the code exchange. A refresh token provides your app continuous access to Google APIs while the user is not present in your application. To request a refresh token, add set the access_type parameter to offline in your authentication request.

Considerations:

• Be sure to store the refresh token safely and permanently, because you can only obtain a refresh token the first time that you perform the code exchange flow.

• There are limits on the number of refresh tokens that are issued: one limit per client/user combination, and another per user across all clients. If your application requests too many refresh tokens, it may run into these limits, in which case older refresh tokens stop working.

[aaaguirrep]

Thanks @panva for your help and congratulation for the library. I have retrieved the refresh_token, I did a new authentication process and it worked. I was not trying with the first login.