flawopen.com/Reference/JWT vs. HttpOnly Cookies

JWT in localStorage vs. HttpOnly cookies: which is safer?

Authentication Guide

Short answer

HttpOnly SameSite cookies are safer for web applications. Storing tokens in localStorage makes them vulnerable to total exfiltration via any XSS flaw on your domain. HttpOnly cookies cannot be read by JavaScript, eliminating XSS token theft.

The Security Trade-Offs

Storage Location	XSS Threat	CSRF Threat	Revocation Speed
`localStorage`	Token can be stolen by script	Immune to CSRF	Difficult without server state
`HttpOnly Cookie`	Script cannot access token	Protected by `SameSite=Lax`	Instant via server-side session

Recommended Architecture

✓Store session identifiers in HttpOnly; Secure; SameSite=Lax cookies.
✓Avoid storing persistent authentication tokens in localStorage or sessionStorage.