How JWT Refresh Tokens Improve Security Without Disrupting User Experience

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Modern web applications rely on JSON Web Tokens (JWTs) to manage user authentication after login, but a single long-lived token poses a security risk if stolen. To address this, developers use two separate tokens: a short-lived access token for API requests and a longer-lived refresh token to obtain new access tokens silently. Short access tokens — typically expiring in 10 to 15 minutes — limit the damage if compromised, while the refresh token handles session continuity without requiring the user to log in again. When an access token expires, the client sends the refresh token to the server, which validates it and issues a fresh access token. Refresh tokens are treated as sensitive credentials and are typically stored in HttpOnly, Secure cookies to reduce exposure to client-side attacks.

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