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Utilnivo

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Utilnivo

Inspect JWT Token

Inspect JWT tokens—view header, payload, and claim details instantly.

No registration
  • On your device

Browse more in Developer or all tools.

Private on your device

Your information stays on your device and is not uploaded.

Related tools

What is a JWT decoder?

A JWT decoder reads the header and payload of a JSON Web Token without verifying signatures. Useful for debugging auth tokens locally—never paste production secrets into untrusted sites.

This inspect JWT token tool breaks JSON Web Tokens into header and payload JSON for quick auth debugging. Paste a bearer token from Postman, browser storage, or logs to read algorithms, expiry, and issuer claims without leaving your browser.

Inspection is for debugging—never treat decoded tokens as proof of identity without cryptographic verification.

Rotate tokens if you accidentally expose production JWTs in tickets or screen shares.

How to use this tool

Paste the JWT string, review decoded header and payload panels, and note `alg`, `exp`, and custom claims.

Worked example

Example: inspect a staging access token to confirm `iss` matches your Auth0 tenant before updating API middleware.

When to use this

  • Debugging 403 errors after role changes.
  • Validating token shape during CI integration tests.
  • Explaining JWT anatomy to new team members.

Common examples

  • Access token from OAuth login → inspect `exp`, `sub`, and `roles` claims.
  • Staging vs production token → compare `iss` and `aud` without verifying signature locally.
  • Expired session token → confirm `exp` timestamp against current time in the payload view.
  • Staging ID token → confirm `aud` matches your SPA client ID before release.
  • Expired refresh token → verify `exp` claim against local clock skew.

What people search for

Common mistakes

  • Sharing live tokens in Slack or email.
  • Assuming `none` algorithm tokens are safe to accept.
  • Ignoring clock skew when reading `exp` timestamps.

Related long-tail tasks

  • decode jwt header alg field
  • jwt token expiration checker
  • inspect refresh token vs access token

How it works

Paste a JWT (optionally with a Bearer prefix). The tool splits header, payload, and signature, Base64URL-decodes the first two segments, and pretty-prints them as JSON. Common time claims (iat, nbf, exp) are shown as timestamps. Signatures are displayed but not verified.

Limitations

Decoding a JWT does not verify its signature or prove the token is valid, trusted, or unexpired. Do not paste production secrets into untrusted tools.

Privacy and file handling

Your data stays on your device and is not uploaded.

Related JWT Decoder guides

These pages use the same jwt decoder with guides tailored to specific search intents.

FAQ

Frequently asked questions

Can I inspect refresh tokens?

Yes if they are JWT-formatted. Opaque refresh tokens will not decode.

What timezone is exp in?

JWT `exp` is a Unix timestamp in UTC seconds since epoch.

Does inspection modify the token?

No. The tool reads and decodes only—it does not sign or alter tokens.

Related pages

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