Developer
Inspect JWT Token
- Browser-based
- No signup
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.
100% Client-Side
Your data never leaves your computer.
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
- jwt decoder
- decode jwt token
- jwt payload viewer
- json web token decoder
- inspect bearer token
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 is processed in your browser and is not uploaded to our server.
Related JWT Decoder guides
These pages use the same jwt decoder with guides tailored to specific search intents.
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.
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