JWT Decoder

What this tool does

The JWT Decoder splits a JSON Web Token into its header and payload so you can inspect claims such as issuer, subject, audience, expiration time, and custom application fields. Decoding makes the token readable, but it does not prove the signature is valid.

When to use it

• -When debugging authentication or authorization flows.
• -When checking token claims such as exp, iss, aud, sub, or roles.
• -When confirming whether a JWT is expired or contains the expected user context.
• -When comparing tokens returned by staging, local, and production identity providers.

Example input and output

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjMiLCJyb2xlIjoiYWRtaW4ifQ.signature

{
  "sub": "123",
  "role": "admin"
}

Common errors or tips

• -Decoding a JWT is not the same as verifying its signature.
• -Check exp and nbf claims when troubleshooting login or session issues.
• -Do not trust decoded claims until your backend verifies the token signature.
• -Use sample or redacted tokens when documenting authentication bugs.

Privacy and security note

JWT decoding is processed through the tool service. Real tokens can grant access to accounts or APIs, so avoid submitting live production tokens.