Where to Store Tokens
This document explains how to securely store tokens used in token-based authentication. The following assumes a basic knowledge of JSON Web Tokens (JWTs). To learn more about JWTs see:
Where to Store Your JWTs
Tokens can be stored in session storage/local storage or a cookie.
Web Storage (localStorage/sessionStorage)
When logging in a user with a username and password, the response body contains the
access_token JWT. Then you need to handle this response in the client side code. This token can then be stored in localStorage or sessionStorage.
sessionStorage both extend
Storage. The only difference between them is the persistance of the data:
localStorage - data persists until explicitly deleted. Changes made are saved and available for all current and future visits to the site.
sessionStorage - Changes made are saved and available for the current page, as well as future visits to the site on the same window. Once the window is closed, the storage is deleted.
There are different options to control the lifetime of a cookie:
- Cookies can be destroyed after the browser is closed (session cookies).
- Implement a server side check (typically done for you by the web framework in use), and you could implement expiration or sliding window expiration.
- Cookies can be persistent (not destroyed after the browser is closed) with an expiration.
httpOnlyflag is set.