JWT Expiration Calculator
Calculate JWT token expiration times, analyze token lifecycle, and manage authentication timing. Essential for API security, session management, and token refresh strategy planning.
Analyze Existing JWT Token
Calculate New Token Expiration
JWT Expiration Guide
What This Tool Delivers
The JWT Expiration Calculator analyzes token timing, validates expiration logic, and helps plan authentication strategies. Essential for API security, session management, and implementing proper token refresh mechanisms in applications.
Precise timing calculations with live countdown enables proper token lifecycle management. Support for custom expiration calculations and validation streamlines authentication system development and debugging.
iat: Issued At (creation timestamp)
exp: Expiration Time (validity end timestamp)
JWT Security Best Practices
Short-Lived Access Tokens: Use 15-30 minute expiration for access tokens to limit exposure window. Implement automatic refresh mechanisms to maintain user sessions without compromising security.
Implement Token Refresh: Use refresh tokens with longer expiration (7-30 days) to obtain new access tokens. This balances security with user experience by avoiding frequent re-authentication.
Validate All Claims: Always validate iat, exp, nbf, aud, and iss claims in addition to signature verification. Proper claim validation prevents token reuse and timing attacks.
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