kid
Key ID header parameter — references which key in a JWKS was used to sign the token.
Quick Answer
See our full JWT Glossary for related terms, or use the JWT Decoder to inspect tokens in practice.
What is kid?
Key ID header parameter — references which key in a JWKS was used to sign the token.
See It in Practice
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Related
Browse the full JWT Glossary or explore JWT Basics.
kid in JWT Authentication
Understanding kid helps you read RFC 7519, debug tokens, and design secure authentication. JWTs combine header, payload claims, and a cryptographic signature.
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