oauth - What is the length of the access_token in Facebook OAuth2?

Question

I searched on Google and StackOverflow to find a answer to my question but I can't find one.

I'd like to store the access_token to my database for offline access and I'd like to be sure to specify the correct length of my column.

I can't even find if it's just a number or a mix between number and strings.

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.