Breaking down JSON Web Tokens
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Breaking down JSON Web Tokens

From pros and cons to building and revoking

About the Book

JSON Web Tokens, or JWTs, are self-contained, portable, stateless tokens that are often issued by identity providers or otherwise used to safely transmit state between different parts of a system.

This book will dive deep into various aspects of JWTs, from creation to revocation. You'll also learn about all the pieces of a JWT and how you can validate them, should you be building an API or microservice that is presented with one.

About the Author

The FusionAuth Team
The FusionAuth Team

Brian Pontarelli is CEO and founder of FusionAuth.

Dan Moore is head of developer relations at FusionAuth.

Table of Contents

  • What are JWTs
  • Building a Secure Signed JWT
    • Definitions
    • Out of scope
    • Security considerations
    • Creating tokens
    • Holding tokens
    • Consuming a JWT
    • In conclusion
  • Pros and Cons of JWTs
    • JWTs expire at specific intervals
    • JWTs are signed
    • JWTs aren’t easily revocable
    • JWTs have exploits
    • Sessions as an alternative
  • Revoking JWTs & JWT Expiration
    • Reduce the duration of the JWT
    • Rotate keys
    • Build a deny list
    • Conclusion
  • Anatomy of a JWT
    • The header
    • The body
    • Signature
    • Limits
    • Conclusion
  • Conclusion

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