iat
Issued At claim — Unix timestamp when the token was created. Useful for freshness checks and debugging.
Quick Answer
See our full JWT Glossary for related terms, or use the JWT Decoder to inspect tokens in practice.
What is iat?
Issued At claim — Unix timestamp when the token was created. Useful for freshness checks and debugging.
See It in Practice
Paste any JWT into our JWT Decoder to see related claims in action. Use the JWT Debugger for detailed analysis.
Related
Browse the full JWT Glossary or explore JWT Basics.
iat in JWT Authentication
Understanding iat helps you read RFC 7519, debug tokens, and design secure authentication. JWTs combine header, payload claims, and a cryptographic signature.
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