11/7/2023 0 Comments Decode jwt token typescriptYou'll see the little message I left for you, but you'll also see a big red "Invalid Signature" warning in the bottom left. You can try this for yourself! Just enter the following JSON Web Token string at and set the algorithm to HS512: 7lC3rFLiNHXwefUu3OQ-R203pGfB87-dIrk2S-vqfaygIWFwZKzmGHr6pzYkl2a0HkY0fdwa38yLWu8Zdhg You read that correctly, anybody can copy a JWT and parse it without the signing key - the values are not encrypted, just hashed. These tokens are nifty for several reasons, but for me personally, I think the niftiest thing about them is that they can be easily parsed and ready by anybody without the signing key. The only way it can be spoofed is for the attacker to get a hold of your secret signing key. The token is signed with a specific algorithm and a secret key that you control, so you're always able to verify that the token a client has sent is indeed one that your application issued. JSON Web Tokens, commonly abbreviated JWT, are a method for storing a user's session data in a hashed string and using it for authentication. Whether you're using them in production right now, or you've only seen the words "JWT" and haven't had a chance to explore it further, this newfangled authentication system is skyrocketing in popularity thanks to its simplicity and ease of use. If you've hung out on the web development subreddits or Hacker News, you've probably heard of JSON Web Tokens.
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