Header + payload decode
Algorithm, type, and claims all readable side by side.
Dev Workbench
Inspect JWTs without touching the secret
Decode header and payload claims locally so you can debug sessions safely.
#jwt#authFree
Inspect the header and claims of a token
3Parts decoded
0Secrets exposed
<1sInspect time
Why it works
Header + built in
Claim inspector
Registered and custom claims laid out instead of buried in base64.
Local-only processing
Tokens are decoded in your browser session, never uploaded.
Where it pays off
Made for real workflows
Session debugging
Figure out which claims a broken session is actually carrying.
Access-token audits
Review exp, scope, and issuer claims across tokens.
OAuth flows
Trace what identity providers put inside their tokens.
FAQ
Quick answers
Do you verify the signature?
No — decoding reads the payload. Signature verification stays with your auth layer.
Is the token sent anywhere?
No. Everything happens locally in your session.
Learn
Guides that pair with this tool
Blog
How to Inspect a JWT Token Without Revealing Secrets
Learn how to inspect and decode JSON Web Tokens safely in your browser without exposing sensitive payloads, session tokens, or private secret keys to third-party servers.
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How to Decode a JWT Token: A Step-by-Step Guide for Developers
Learn how JSON Web Tokens work, understand Base64URL decoding, and step-by-step parse JWT headers and payloads in JavaScript, Python, or online tools.
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How to Format JSON for Readability and Debugging: A Comprehensive Guide
Master JSON formatting techniques to improve code readability, fix syntax errors quickly, and streamline API debugging using CLI utilities, IDEs, and online tools.
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JSON Formatter
Beautify, minify, and validate JSON payloads with configurable indentation.
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JSON Validator
Check JSON syntax and get a precise error location when something is off.
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Base64 Encoder
Encode text to Base64 and decode Base64 back to readable text.
Every tool is free, forever.
JWT Decoder runs with no account, no credit card, and no usage limits — just open the workspace and go.