Back to feed
Dev.to
Dev.to
7/3/2026
Stop pasting JWTs into random websites

Stop pasting JWTs into random websites

Short summary

Production JWTs are live credentials with expiration times—not just readable JSON. Pasting them into online decoders risks exposure even if sites claim browser-side processing. Safer approach: decode locally via terminal (base64/jq) or verified local-only tools. Rotate tokens if exposed.

  • •JWTs are bearer tokens, not just readable JSON—even though the payload is Base64URL-encoded, the whole token is a credential
  • •Online JWT decoders might transmit your token to a backend, even if they claim to run client-side—you can't verify from the UI
  • •Use command-line tools (echo, cut, base64, jq) or a verified local-only decoder; always rotate tokens if they've been exposed

Generated with AI, which can make mistakes.

#certification-education
Read full article at Dev.to

Is this a good recommendation for you?

Comments

Failed to load comments. Please try again.

Explore more

The headline is about JWT security - pasting JWTs into online decoders leaks credentials, and there's a browser-only fix.
Dev.to
How to Decode JWT Tokens Without a Backend
Dev.to
The original title is: "What's Actually Inside a JWT (and Why Decoding One Isn't Verifying It)"
Dev.to
The original title is "Decoding JWT: It's Not Encryption, It's a Signature"
Dev.to