Can access token be longer than 255 characters?

Question

When allowing login by OAuth (such as OpenID, Facebook, Twitter, etc), we save the access token given by the Oath provider in mysql database for future authentication. In some tutorials, the column for saving access token is varchar(255) and some use text. I wonder if the access token (by common websites such as facebook and twitter) is longer than 255 character needing text column. Should we consider this possibility?

Answer 1

I work at Facebook and I can give a definitive answer about this.

Please don't put a maximum size on the storage for an access token. We expect that they will both grow and shrink over time as we add and remove data and change how they are encoded.

We did give guidance in one place about it being 255 characters. I've updated the blog post that had that information and updated our new access token docs to include a note about sizes:

https://developers.facebook.com/docs/facebook-login/access-tokens/

Sorry for the confusion.