Authentication token storage in modern web apps: A security-focused analysis of localStorage, cookies, and in-memory approaches
A deep technical analysis of authentication token storage strategies in modern web applications. The article examines the trade-offs between localStorage, sessionStorage, cookies (with various flags), and in-memory storage for JWT tokens, addressing security concerns like XSS and CSRF attacks. It provides a comprehensive breakdown of each approach's security posture, developer experience, and practical use cases, ultimately arguing that no single solution is universally best — the choice depends on the application's threat model, architecture, and user experience requirements.
Key quotes
Ask ten frontend developers where to store a login token, and you'll get four answers and an argument.
And because each approach addresses different concerns, the debates continue without resolution.
Where should your auth token live so an XSS bug can't steal it? Here's how to build auth that survives the crazy non-secure world we live in.
Every 'build a full-stack app in an afternoon' article and tutorial has written this.
From the article
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