Hi Sorry in advance if this has already been asked I seached

Question

Hi Sorry in advance if this has already been asked I seached through the search engine but didn t find the information I d like to know if there is a way to sign in with an email or a custom username The ` recipe signin` API request parameters are only `email` and `password` but maybe there s a way to extend something and supports `email` or `username` parameters Thanks in advance for your replies and suggestions

rp · Answer

Hey

rp · Answer

This is possible You would need to give your own validation function on the frontend and backend that verifies the user input to allow email or username s

rp · Answer

Checkout form field validators section in docs

jeremyb · Answer

Thanks for your reploy < rp> I saw in the documentation that I can add some extra fields with custom validation in the sign up form https supertokens com docs emailpassword common customizations signup form adding fields I also saw that I can change the `email` field label https supertokens com docs emailpassword common customizations signin form changing field labels but I m not sure that I can extend the backend sign in process to handle authentication with email or username What I m looking for is that the user can fill the sign in form with his email e g `john doe gmail com` or his username e g `john doe` and his password of course

rp · Answer

So you can achieve that by changing the validator of the email on the frontend and backend to allow for an email or username

rp · Answer

And then things should just work

rp · Answer

Of course sending email verification emails or reset password emails will not work with a username But you can override the APIs on the backend to return a nice error message in case the user has used a username

rp · Answer

See this https supertokens com docs emailpassword common customizations signup form field validators

jeremyb · Answer

I think I see your point the idea is to save an email or a username in the `email` property with a custom validator but it ll not offer a way for the member to sign in with his email or his username What I m looking for is to save both member s email and username and to handle this 2 information in the sign in form You mention that you can override the APIs on the backend do you have any documentation of this

rp · Answer

Ahh I see So in the sign up form you can add an extra field for the username And during sign in you can override the backend sign in api to detect if the input is a username you fetch the email first and then call the original implementation with the email and password

rp · Answer

See the advanced customisation override section > backend APIs section in the docs

rp · Answer

https supertokens com docs emailpassword advanced customizations apis override about

jeremyb · Answer

Wow it was exactly what I was looking for Thanks a lot for your time and your help